64931923 has 4 divisors (see below), whose sum is σ = 74207920. Its totient is φ = 55655928.

The previous prime is 64931869. The next prime is 64931927. The reversal of 64931923 is 32913946.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64931923 - 2¹⁷ = 64800851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64931927) 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, 4637988 + ... + 4638001.

It is an arithmetic number, because the mean of its divisors is an integer number (18551980).

Almost surely, 2^64931923 is an apocalyptic number.

64931923 is a deficient number, since it is larger than the sum of its proper divisors (9275997).

64931923 is an equidigital number, since it uses as much as digits as its factorization.

64931923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9275996.

The product of its digits is 34992, while the sum is 37.

The square root of 64931923 is about 8058.0346859517. The cubic root of 64931923 is about 401.9321581349.

The spelling of 64931923 in words is "sixty-four million, nine hundred thirty-one thousand, nine hundred twenty-three".