64980921 has 8 divisors (see below), whose sum is σ = 88061824. Its totient is φ = 42610320.

The previous prime is 64980901. The next prime is 64980943. The reversal of 64980921 is 12908946.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64980921 - 2⁶ = 64980857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64980921.

It is not an unprimeable number, because it can be changed into a prime (64980901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177361 + ... + 177726.

It is an arithmetic number, because the mean of its divisors is an integer number (11007728).

Almost surely, 2^64980921 is an apocalyptic number.

64980921 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

64980921 is a deficient number, since it is larger than the sum of its proper divisors (23080903).

64980921 is a wasteful number, since it uses less digits than its factorization.

64980921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355151.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 64980921 is about 8061.0744321089. The cubic root of 64980921 is about 402.0332328161.

The spelling of 64980921 in words is "sixty-four million, nine hundred eighty thousand, nine hundred twenty-one".