628993511 has 4 divisors (see below), whose sum is σ = 629604624. Its totient is φ = 628382400.

The previous prime is 628993507. The next prime is 628993543. The reversal of 628993511 is 115399826.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 628993511 - 2² = 628993507 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 (628993501) 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, 304010 + ... + 306071.

It is an arithmetic number, because the mean of its divisors is an integer number (157401156).

Almost surely, 2^628993511 is an apocalyptic number.

628993511 is a deficient number, since it is larger than the sum of its proper divisors (611113).

628993511 is a wasteful number, since it uses less digits than its factorization.

628993511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611112.

The product of its digits is 116640, while the sum is 44.

The square root of 628993511 is about 25079.7430409484. The cubic root of 628993511 is about 856.8051239180.

The spelling of 628993511 in words is "six hundred twenty-eight million, nine hundred ninety-three thousand, five hundred eleven".