620812949664 has 24 divisors (see below), whose sum is σ = 1629633993120. Its totient is φ = 206937649856.

The previous prime is 620812949621. The next prime is 620812949699. The reversal of 620812949664 is 466949218026.

It is a tau number, because it is divible by the number of its divisors (24).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3233400684 + ... + 3233400875.

It is an arithmetic number, because the mean of its divisors is an integer number (67901416380).

Almost surely, 2^620812949664 is an apocalyptic number.

It is an amenable number.

620812949664 is an abundant number, since it is smaller than the sum of its proper divisors (1008821043456).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

620812949664 is a wasteful number, since it uses less digits than its factorization.

620812949664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6466801572 (or 6466801564 counting only the distinct ones).

The product of its (nonzero) digits is 8957952, while the sum is 57.

The spelling of 620812949664 in words is "six hundred twenty billion, eight hundred twelve million, nine hundred forty-nine thousand, six hundred sixty-four".