628744391 has 8 divisors (see below), whose sum is σ = 686544768. Its totient is φ = 571051000.

The previous prime is 628744379. The next prime is 628744393. The reversal of 628744391 is 193447826.

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

It is a cyclic number.

It is not a de Polignac number, because 628744391 - 2¹⁴ = 628728007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628744393) 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, 14195 + ... + 38196.

It is an arithmetic number, because the mean of its divisors is an integer number (85818096).

Almost surely, 2^628744391 is an apocalyptic number.

628744391 is a deficient number, since it is larger than the sum of its proper divisors (57800377).

628744391 is a wasteful number, since it uses less digits than its factorization.

628744391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53493.

The product of its digits is 290304, while the sum is 44.

The square root of 628744391 is about 25074.7759910233. The cubic root of 628744391 is about 856.6919931918.

The spelling of 628744391 in words is "six hundred twenty-eight million, seven hundred forty-four thousand, three hundred ninety-one".