64499731 has 2 divisors, whose sum is σ = 64499732. Its totient is φ = 64499730.

The previous prime is 64499723. The next prime is 64499767. The reversal of 64499731 is 13799446.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64499731 - 2³ = 64499723 is a prime.

It is a super-2 number, since 2×64499731² = 8320430598144722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64499791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32249865 + 32249866.

It is an arithmetic number, because the mean of its divisors is an integer number (32249866).

Almost surely, 2^64499731 is an apocalyptic number.

64499731 is a deficient number, since it is larger than the sum of its proper divisors (1).

64499731 is an equidigital number, since it uses as much as digits as its factorization.

64499731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 43.

The square root of 64499731 is about 8031.1724548786. The cubic root of 64499731 is about 401.0384081884.

The spelling of 64499731 in words is "sixty-four million, four hundred ninety-nine thousand, seven hundred thirty-one".