65289840 has 160 divisors (see below), whose sum is σ = 252412416. Its totient is φ = 13562880.

The previous prime is 65289839. The next prime is 65289841. The reversal of 65289840 is 4898256.

It is an interprime number because it is at equal distance from previous prime (65289839) and next prime (65289841).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 65289792 and 65289801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65289841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16714 + ... + 20246.

Almost surely, 2^65289840 is an apocalyptic number.

65289840 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 65289840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126206208).

65289840 is an abundant number, since it is smaller than the sum of its proper divisors (187122576).

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

65289840 is a wasteful number, since it uses less digits than its factorization.

65289840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3567 (or 3561 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 65289840 is about 8080.2128684831. The cubic root of 65289840 is about 402.6693139503.

The spelling of 65289840 in words is "sixty-five million, two hundred eighty-nine thousand, eight hundred forty".