616521428 has 24 divisors (see below), whose sum is σ = 1140889344. Its totient is φ = 291038400.

The previous prime is 616521383. The next prime is 616521457. The reversal of 616521428 is 824125616.

It is a congruent number.

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, 55550 + ... + 65717.

It is an arithmetic number, because the mean of its divisors is an integer number (47537056).

Almost surely, 2^616521428 is an apocalyptic number.

It is an amenable number.

616521428 is a deficient number, since it is larger than the sum of its proper divisors (524367916).

616521428 is a wasteful number, since it uses less digits than its factorization.

616521428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121343 (or 121341 counting only the distinct ones).

The product of its digits is 23040, while the sum is 35.

The square root of 616521428 is about 24829.8495363947. The cubic root of 616521428 is about 851.1041834556.

The spelling of 616521428 in words is "six hundred sixteen million, five hundred twenty-one thousand, four hundred twenty-eight".