64861020 has 96 divisors (see below), whose sum is σ = 230630400. Its totient is φ = 14824512.

The previous prime is 64861019. The next prime is 64861039. The reversal of 64861020 is 2016846.

64861020 is a `hidden beast` number, since 6 + 48 + 610 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4800 + ... + 12359.

It is an arithmetic number, because the mean of its divisors is an integer number (2402400).

Almost surely, 2^64861020 is an apocalyptic number.

64861020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64861020 is an abundant number, since it is smaller than the sum of its proper divisors (165769380).

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

64861020 is a wasteful number, since it uses less digits than its factorization.

64861020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17184 (or 17176 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 64861020 is about 8053.6339623800. The cubic root of 64861020 is about 401.7858070349.

Adding to 64861020 its reverse (2016846), we get a palindrome (66877866).

The spelling of 64861020 in words is "sixty-four million, eight hundred sixty-one thousand, twenty".