64623967 has 2 divisors, whose sum is σ = 64623968. Its totient is φ = 64623966.

The previous prime is 64623943. The next prime is 64623971. The reversal of 64623967 is 76932646.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64623967 is a prime.

It is a super-2 number, since 2×64623967² = 8352514221634178, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64621967) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32311983 + 32311984.

It is an arithmetic number, because the mean of its divisors is an integer number (32311984).

Almost surely, 2^64623967 is an apocalyptic number.

64623967 is a deficient number, since it is larger than the sum of its proper divisors (1).

64623967 is an equidigital number, since it uses as much as digits as its factorization.

64623967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 43.

The square root of 64623967 is about 8038.9033456063. The cubic root of 64623967 is about 401.2957294310.

The spelling of 64623967 in words is "sixty-four million, six hundred twenty-three thousand, nine hundred sixty-seven".