64396987260 has 60 divisors (see below), whose sum is σ = 181313295240. Its totient is φ = 17077654080.

The previous prime is 64396987247. The next prime is 64396987267. The reversal of 64396987260 is 6278969346.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a junction number, because it is equal to n+sod(n) for n = 64396987194 and 64396987203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64396987267) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 355784370 + ... + 355784550.

It is an arithmetic number, because the mean of its divisors is an integer number (3021888254).

Almost surely, 2^64396987260 is an apocalyptic number.

64396987260 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64396987260 is an abundant number, since it is smaller than the sum of its proper divisors (116916307980).

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

64396987260 is an frugal number, since it uses more digits than its factorization.

64396987260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736 (or 191 counting only the distinct ones).

The product of its (nonzero) digits is 23514624, while the sum is 60.

Multiplying 64396987260 by its sum of digits (60), we get a square (3863819235600 = 1965660²).

64396987260 divided by its sum of digits (60) gives a 4-th power (1073283121 = 181⁴).

The spelling of 64396987260 in words is "sixty-four billion, three hundred ninety-six million, nine hundred eighty-seven thousand, two hundred sixty".