616991648 has 48 divisors (see below), whose sum is σ = 1495025280. Its totient is φ = 244083456.

The previous prime is 616991623. The next prime is 616991651. The reversal of 616991648 is 846199616.

It is a junction number, because it is equal to n+sod(n) for n = 616991596 and 616991605.

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, 103028 + ... + 108851.

It is an arithmetic number, because the mean of its divisors is an integer number (31146360).

Almost surely, 2^616991648 is an apocalyptic number.

It is an amenable number.

616991648 is an abundant number, since it is smaller than the sum of its proper divisors (878033632).

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

616991648 is a wasteful number, since it uses less digits than its factorization.

616991648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211909 (or 211901 counting only the distinct ones).

The product of its digits is 559872, while the sum is 50.

The square root of 616991648 is about 24839.3165767499. The cubic root of 616991648 is about 851.3205071109.

The spelling of 616991648 in words is "six hundred sixteen million, nine hundred ninety-one thousand, six hundred forty-eight".