616720724 has 6 divisors (see below), whose sum is σ = 1079261274. Its totient is φ = 308360360.

The previous prime is 616720721. The next prime is 616720733. The reversal of 616720724 is 427027616.

It can be written as a sum of positive squares in only one way, i.e., 433389124 + 183331600 = 20818^2 + 13540^2 .

It is a super-2 number, since 2×616720724² = 760688902822168352, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616720721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77090087 + ... + 77090094.

It is an arithmetic number, because the mean of its divisors is an integer number (179876879).

Almost surely, 2^616720724 is an apocalyptic number.

It is an amenable number.

616720724 is a deficient number, since it is larger than the sum of its proper divisors (462540550).

616720724 is a wasteful number, since it uses less digits than its factorization.

616720724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154180185 (or 154180183 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 616720724 is about 24833.8624462648. The cubic root of 616720724 is about 851.1958825584.

The spelling of 616720724 in words is "six hundred sixteen million, seven hundred twenty thousand, seven hundred twenty-four".