616688478 has 80 divisors (see below), whose sum is σ = 1583539584. Its totient is φ = 175718160.

The previous prime is 616688477. The next prime is 616688521. The reversal of 616688478 is 874886616.

616688478 is a `hidden beast` number, since 6 + 166 + 8 + 8 + 478 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616688477) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 783201 + ... + 783987.

Almost surely, 2^616688478 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 616688478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (791769792).

616688478 is an abundant number, since it is smaller than the sum of its proper divisors (966851106).

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

616688478 is a wasteful number, since it uses less digits than its factorization.

616688478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1499 (or 1490 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 54.

The square root of 616688478 is about 24833.2132032889. The cubic root of 616688478 is about 851.1810470260.

The spelling of 616688478 in words is "six hundred sixteen million, six hundred eighty-eight thousand, four hundred seventy-eight".