64623529 has 2 divisors, whose sum is σ = 64623530. Its totient is φ = 64623528.

The previous prime is 64623521. The next prime is 64623547. The reversal of 64623529 is 92532646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62773929 + 1849600 = 7923^2 + 1360^2 .

It is a cyclic number.

It is not a de Polignac number, because 64623529 - 2³ = 64623521 is a prime.

It is not a weakly prime, because it can be changed into another prime (64623521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32311764 + 32311765.

It is an arithmetic number, because the mean of its divisors is an integer number (32311765).

Almost surely, 2^64623529 is an apocalyptic number.

It is an amenable number.

64623529 is a deficient number, since it is larger than the sum of its proper divisors (1).

64623529 is an equidigital number, since it uses as much as digits as its factorization.

64623529 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 37.

The square root of 64623529 is about 8038.8761030383. The cubic root of 64623529 is about 401.2948228121.

The spelling of 64623529 in words is "sixty-four million, six hundred twenty-three thousand, five hundred twenty-nine".