620664536 has 8 divisors (see below), whose sum is σ = 1163746020. Its totient is φ = 310332264.

The previous prime is 620664481. The next prime is 620664553. The reversal of 620664536 is 635466026.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 620664536.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 38791526 + ... + 38791541.

Almost surely, 2^620664536 is an apocalyptic number.

It is an amenable number.

620664536 is a deficient number, since it is larger than the sum of its proper divisors (543081484).

620664536 is a wasteful number, since it uses less digits than its factorization.

620664536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77583073 (or 77583069 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 38.

The square root of 620664536 is about 24913.1398262042. The cubic root of 620664536 is about 853.0064406817.

The spelling of 620664536 in words is "six hundred twenty million, six hundred sixty-four thousand, five hundred thirty-six".