628804431 has 16 divisors (see below), whose sum is σ = 942789120. Its totient is φ = 414150840.

The previous prime is 628804367. The next prime is 628804481. The reversal of 628804431 is 134408826.

It is not a de Polignac number, because 628804431 - 2⁶ = 628804367 is a prime.

It is a super-2 number, since 2×628804431² = 790790024890467522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628804481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138055 + ... + 142536.

It is an arithmetic number, because the mean of its divisors is an integer number (58924320).

Almost surely, 2^628804431 is an apocalyptic number.

628804431 is a deficient number, since it is larger than the sum of its proper divisors (313984689).

628804431 is a wasteful number, since it uses less digits than its factorization.

628804431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280683 (or 280677 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 628804431 is about 25075.9731815138. The cubic root of 628804431 is about 856.7192613741.

The spelling of 628804431 in words is "six hundred twenty-eight million, eight hundred four thousand, four hundred thirty-one".