64620690436 has 9 divisors (see below), whose sum is σ = 113087097991. Its totient is φ = 32310091012.

The previous prime is 64620690413. The next prime is 64620690437. The reversal of 64620690436 is 63409602646.

The square root of 64620690436 is 254206.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64620690437) by changing a digit.

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 in 2 ways as a sum of consecutive naturals, for example, 444861 + ... + 571963.

Almost surely, 2^64620690436 is an apocalyptic number.

64620690436 is the 254206-th square number.

It is an amenable number.

64620690436 is a deficient number, since it is larger than the sum of its proper divisors (48466407555).

64620690436 is an frugal number, since it uses more digits than its factorization.

64620690436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254210 (or 127105 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 46.

The spelling of 64620690436 in words is "sixty-four billion, six hundred twenty million, six hundred ninety thousand, four hundred thirty-six".