431617728 has 56 divisors (see below), whose sum is σ = 1172872432. Its totient is φ = 139981824.

The previous prime is 431617727. The next prime is 431617801. The reversal of 431617728 is 827716134.

It is not an unprimeable number, because it can be changed into a prime (431617721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23275 + ... + 37482.

Almost surely, 2^431617728 is an apocalyptic number.

431617728 is a gapful number since it is divisible by the number (48) formed by its first and last digit.

It is an amenable number.

431617728 is an abundant number, since it is smaller than the sum of its proper divisors (741254704).

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

431617728 is a wasteful number, since it uses less digits than its factorization.

431617728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60809 (or 60799 counting only the distinct ones).

The product of its digits is 56448, while the sum is 39.

The square root of 431617728 is about 20775.4116204710. The cubic root of 431617728 is about 755.7295861067.

The spelling of 431617728 in words is "four hundred thirty-one million, six hundred seventeen thousand, seven hundred twenty-eight".