64921023 has 24 divisors (see below), whose sum is σ = 95567472. Its totient is φ = 42461568.

The previous prime is 64921009. The next prime is 64921067. The reversal of 64921023 is 32012946.

64921023 is a `hidden beast` number, since 649 + 2 + 10 + 2 + 3 = 666.

It is not a de Polignac number, because 64921023 - 2⁴ = 64921007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64921093) 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, 173865 + ... + 174237.

It is an arithmetic number, because the mean of its divisors is an integer number (3981978).

Almost surely, 2^64921023 is an apocalyptic number.

64921023 is a deficient number, since it is larger than the sum of its proper divisors (30646449).

64921023 is a wasteful number, since it uses less digits than its factorization.

64921023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695 (or 692 counting only the distinct ones).

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

The square root of 64921023 is about 8057.3583139885. The cubic root of 64921023 is about 401.9096663440.

Adding to 64921023 its reverse (32012946), we get a palindrome (96933969).

The spelling of 64921023 in words is "sixty-four million, nine hundred twenty-one thousand, twenty-three".