65401020 has 72 divisors (see below), whose sum is σ = 205745904. Its totient is φ = 17438976.

The previous prime is 65401009. The next prime is 65401031. The reversal of 65401020 is 2010456.

It is a happy number.

65401020 is a `hidden beast` number, since 654 + 0 + 10 + 2 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (65401009) and next prime (65401031).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 65400984 and 65401002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1869 + ... + 11588.

It is an arithmetic number, because the mean of its divisors is an integer number (2857582).

Almost surely, 2^65401020 is an apocalyptic number.

65401020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65401020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102872952).

65401020 is an abundant number, since it is smaller than the sum of its proper divisors (140344884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65401020 is a wasteful number, since it uses less digits than its factorization.

65401020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13481 (or 13467 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 65401020 is about 8087.0897113857. The cubic root of 65401020 is about 402.8977486070.

Adding to 65401020 its reverse (2010456), we get a palindrome (67411476).

The spelling of 65401020 in words is "sixty-five million, four hundred one thousand, twenty".