628525391 has 8 divisors (see below), whose sum is σ = 677083680. Its totient is φ = 579997152.

The previous prime is 628525369. The next prime is 628525399. The reversal of 628525391 is 193525826.

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 628525391 - 2²² = 624331087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628525399) 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, 55661 + ... + 65993.

It is an arithmetic number, because the mean of its divisors is an integer number (84635460).

Almost surely, 2^628525391 is an apocalyptic number.

628525391 is a deficient number, since it is larger than the sum of its proper divisors (48558289).

628525391 is a wasteful number, since it uses less digits than its factorization.

628525391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15025.

The product of its digits is 129600, while the sum is 41.

The square root of 628525391 is about 25070.4086723771. The cubic root of 628525391 is about 856.5925159180.

The spelling of 628525391 in words is "six hundred twenty-eight million, five hundred twenty-five thousand, three hundred ninety-one".