630781690 has 64 divisors (see below), whose sum is σ = 1419441408. Its totient is φ = 196070400.

The previous prime is 630781667. The next prime is 630781709. The reversal of 630781690 is 96187036.

It is a super-2 number, since 2×630781690² = 795771080878512200, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 354082 + ... + 355858.

It is an arithmetic number, because the mean of its divisors is an integer number (22178772).

Almost surely, 2^630781690 is an apocalyptic number.

630781690 is an abundant number, since it is smaller than the sum of its proper divisors (788659718).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

630781690 is a wasteful number, since it uses less digits than its factorization.

630781690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2263.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 630781690 is about 25115.3676063083. The cubic root of 630781690 is about 857.6162988570.

The spelling of 630781690 in words is "six hundred thirty million, seven hundred eighty-one thousand, six hundred ninety".