64690357 has 2 divisors, whose sum is σ = 64690358. Its totient is φ = 64690356.

The previous prime is 64690349. The next prime is 64690391. The reversal of 64690357 is 75309646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52794756 + 11895601 = 7266^2 + 3449^2 .

It is a cyclic number.

It is not a de Polignac number, because 64690357 - 2³ = 64690349 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64690057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32345178 + 32345179.

It is an arithmetic number, because the mean of its divisors is an integer number (32345179).

Almost surely, 2^64690357 is an apocalyptic number.

It is an amenable number.

64690357 is a deficient number, since it is larger than the sum of its proper divisors (1).

64690357 is an equidigital number, since it uses as much as digits as its factorization.

64690357 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 40.

The square root of 64690357 is about 8043.0315801941. The cubic root of 64690357 is about 401.4331031565.

The spelling of 64690357 in words is "sixty-four million, six hundred ninety thousand, three hundred fifty-seven".