64023921 has 24 divisors (see below), whose sum is σ = 105454440. Its totient is φ = 37080576.

The previous prime is 64023907. The next prime is 64023937. The reversal of 64023921 is 12932046.

It can be written as a sum of positive squares in 4 ways, for example, as 3744225 + 60279696 = 1935^2 + 7764^2 .

It is not a de Polignac number, because 64023921 - 2⁵ = 64023889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64023961) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14106 + ... + 18083.

It is an arithmetic number, because the mean of its divisors is an integer number (4393935).

Almost surely, 2^64023921 is an apocalyptic number.

It is an amenable number.

64023921 is a deficient number, since it is larger than the sum of its proper divisors (41430519).

64023921 is a wasteful number, since it uses less digits than its factorization.

64023921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32225 (or 32222 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 64023921 is about 8001.4949228254. The cubic root of 64023921 is about 400.0498292090.

Adding to 64023921 its reverse (12932046), we get a palindrome (76955967).

The spelling of 64023921 in words is "sixty-four million, twenty-three thousand, nine hundred twenty-one".