617632428 has 96 divisors (see below), whose sum is σ = 1681039360. Its totient is φ = 172860480.

The previous prime is 617632403. The next prime is 617632447. The reversal of 617632428 is 824236716.

It is a happy number.

It is a super-2 number, since 2×617632428² = 762939632234350368, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1081383 + ... + 1081953.

Almost surely, 2^617632428 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 617632428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (840519680).

617632428 is an abundant number, since it is smaller than the sum of its proper divisors (1063406932).

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

617632428 is a wasteful number, since it uses less digits than its factorization.

617632428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 827 (or 825 counting only the distinct ones).

The product of its digits is 96768, while the sum is 39.

The square root of 617632428 is about 24852.2117325601. The cubic root of 617632428 is about 851.6151196436.

The spelling of 617632428 in words is "six hundred seventeen million, six hundred thirty-two thousand, four hundred twenty-eight".