628994031 has 8 divisors (see below), whose sum is σ = 882798720. Its totient is φ = 397259352.

The previous prime is 628994027. The next prime is 628994039. The reversal of 628994031 is 130499826.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 628994031 - 2² = 628994027 is a prime.

It is a super-2 number, since 2×628994031² = 791266982067257922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628994039) 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, 5517435 + ... + 5517548.

It is an arithmetic number, because the mean of its divisors is an integer number (110349840).

Almost surely, 2^628994031 is an apocalyptic number.

628994031 is a deficient number, since it is larger than the sum of its proper divisors (253804689).

628994031 is a wasteful number, since it uses less digits than its factorization.

628994031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11035005.

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 628994031 is about 25079.7534078786. The cubic root of 628994031 is about 856.8053600299.

The spelling of 628994031 in words is "six hundred twenty-eight million, nine hundred ninety-four thousand, thirty-one".