64698520 has 16 divisors (see below), whose sum is σ = 145571760. Its totient is φ = 25879392.

The previous prime is 64698511. The next prime is 64698527. The reversal of 64698520 is 2589646.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 1617463 = 64698520 / (6 + 4 + 6 + 9 + 8 + 5 + 2 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64698527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 808692 + ... + 808771.

It is an arithmetic number, because the mean of its divisors is an integer number (9098235).

Almost surely, 2^64698520 is an apocalyptic number.

It is an amenable number.

64698520 is an abundant number, since it is smaller than the sum of its proper divisors (80873240).

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

64698520 is a wasteful number, since it uses less digits than its factorization.

64698520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1617474 (or 1617470 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 64698520 is about 8043.5390220972. The cubic root of 64698520 is about 401.4499874896.

The spelling of 64698520 in words is "sixty-four million, six hundred ninety-eight thousand, five hundred twenty".