616721064 has 32 divisors (see below), whose sum is σ = 1564818720. Its totient is φ = 202504896.

The previous prime is 616721059. The next prime is 616721071. The reversal of 616721064 is 460127616.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190159 + ... + 193374.

It is an arithmetic number, because the mean of its divisors is an integer number (48900585).

Almost surely, 2^616721064 is an apocalyptic number.

It is an amenable number.

616721064 is an abundant number, since it is smaller than the sum of its proper divisors (948097656).

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

616721064 is a wasteful number, since it uses less digits than its factorization.

616721064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383609 (or 383605 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 616721064 is about 24833.8692917556. The cubic root of 616721064 is about 851.1960389806.

The spelling of 616721064 in words is "six hundred sixteen million, seven hundred twenty-one thousand, sixty-four".