64140923 has 16 divisors (see below), whose sum is σ = 80269056. Its totient is φ = 49791840.

The previous prime is 64140917. The next prime is 64140929. The reversal of 64140923 is 32904146.

It is an interprime number because it is at equal distance from previous prime (64140917) and next prime (64140929).

It is not a de Polignac number, because 64140923 - 2⁸ = 64140667 is a prime.

It is a super-2 number, since 2×64140923² = 8228116006583858, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64140929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21140 + ... + 23982.

It is an arithmetic number, because the mean of its divisors is an integer number (5016816).

Almost surely, 2^64140923 is an apocalyptic number.

64140923 is a deficient number, since it is larger than the sum of its proper divisors (16128133).

64140923 is a wasteful number, since it uses less digits than its factorization.

64140923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3154.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 64140923 is about 8008.8028443707. The cubic root of 64140923 is about 400.2933743594.

The spelling of 64140923 in words is "sixty-four million, one hundred forty thousand, nine hundred twenty-three".