616981536 has 120 divisors (see below), whose sum is σ = 1832935104. Its totient is φ = 203575680.

The previous prime is 616981507. The next prime is 616981537. The reversal of 616981536 is 635189616.

It is a junction number, because it is equal to n+sod(n) for n = 616981491 and 616981500.

It is not an unprimeable number, because it can be changed into a prime (616981537) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 265821 + ... + 268131.

Almost surely, 2^616981536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 616981536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (916467552).

616981536 is an abundant number, since it is smaller than the sum of its proper divisors (1215953568).

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

616981536 is a wasteful number, since it uses less digits than its factorization.

616981536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2436 (or 2419 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 616981536 is about 24839.1130276425. The cubic root of 616981536 is about 851.3158562646.

The spelling of 616981536 in words is "six hundred sixteen million, nine hundred eighty-one thousand, five hundred thirty-six".