630878513 has 4 divisors (see below), whose sum is σ = 634081140. Its totient is φ = 627675888.

The previous prime is 630878503. The next prime is 630878543. The reversal of 630878513 is 315878036.

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

It can be written as a sum of positive squares in 2 ways, for example, as 538564849 + 92313664 = 23207^2 + 9608^2 .

It is a cyclic number.

It is not a de Polignac number, because 630878513 - 2⁸ = 630878257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (630878503) 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, 1601018 + ... + 1601411.

It is an arithmetic number, because the mean of its divisors is an integer number (158520285).

Almost surely, 2^630878513 is an apocalyptic number.

It is an amenable number.

630878513 is a deficient number, since it is larger than the sum of its proper divisors (3202627).

630878513 is a wasteful number, since it uses less digits than its factorization.

630878513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3202626.

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

The square root of 630878513 is about 25117.2950972034. The cubic root of 630878513 is about 857.6601770777.

The spelling of 630878513 in words is "six hundred thirty million, eight hundred seventy-eight thousand, five hundred thirteen".