628750081 has 4 divisors (see below), whose sum is σ = 631070464. Its totient is φ = 626429700.

The previous prime is 628750039. The next prime is 628750093. The reversal of 628750081 is 180057826.

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 628750081 - 2²⁵ = 595195649 is a prime.

It is a super-2 number, since 2×628750081² = 790653328715013122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 628750081.

It is not an unprimeable number, because it can be changed into a prime (628750021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1159785 + ... + 1160326.

It is an arithmetic number, because the mean of its divisors is an integer number (157767616).

Almost surely, 2^628750081 is an apocalyptic number.

It is an amenable number.

628750081 is a deficient number, since it is larger than the sum of its proper divisors (2320383).

628750081 is a wasteful number, since it uses less digits than its factorization.

628750081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2320382.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 628750081 is about 25074.8894514014. The cubic root of 628750081 is about 856.6945774760.

The spelling of 628750081 in words is "six hundred twenty-eight million, seven hundred fifty thousand, eighty-one".