687626051 has 4 divisors (see below), whose sum is σ = 785858352. Its totient is φ = 589393752.

The previous prime is 687626039. The next prime is 687626053. The reversal of 687626051 is 150626786.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687626051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687626053) 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, 49116140 + ... + 49116153.

It is an arithmetic number, because the mean of its divisors is an integer number (196464588).

Almost surely, 2^687626051 is an apocalyptic number.

687626051 is a deficient number, since it is larger than the sum of its proper divisors (98232301).

687626051 is an equidigital number, since it uses as much as digits as its factorization.

687626051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98232300.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 687626051 is about 26222.6247923430. The cubic root of 687626051 is about 882.6410204066.

The spelling of 687626051 in words is "six hundred eighty-seven million, six hundred twenty-six thousand, fifty-one".