627991057 has 4 divisors (see below), whose sum is σ = 655295040. Its totient is φ = 600687076.

The previous prime is 627991043. The next prime is 627991061. The reversal of 627991057 is 750199726.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 627991057 - 2¹⁹ = 627466769 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 627990998 and 627991016.

It is not an unprimeable number, because it can be changed into a prime (627991657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13651957 + ... + 13652002.

It is an arithmetic number, because the mean of its divisors is an integer number (163823760).

Almost surely, 2^627991057 is an apocalyptic number.

It is an amenable number.

627991057 is a deficient number, since it is larger than the sum of its proper divisors (27303983).

627991057 is a wasteful number, since it uses less digits than its factorization.

627991057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27303982.

The product of its (nonzero) digits is 238140, while the sum is 46.

The square root of 627991057 is about 25059.7497393729. The cubic root of 627991057 is about 856.3497061721.

It can be divided in two parts, 6279 and 91057, that added together give a cube (97336 = 46³).

The spelling of 627991057 in words is "six hundred twenty-seven million, nine hundred ninety-one thousand, fifty-seven".