631790690 has 8 divisors (see below), whose sum is σ = 1137223260. Its totient is φ = 252716272.

The previous prime is 631790683. The next prime is 631790693. The reversal of 631790690 is 96097136.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 554649601 + 77141089 = 23551^2 + 8783^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-4 number, since 4×631790690⁴ (a number of 36 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (631790693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31589525 + ... + 31589544.

Almost surely, 2^631790690 is an apocalyptic number.

631790690 is a deficient number, since it is larger than the sum of its proper divisors (505432570).

631790690 is a wasteful number, since it uses less digits than its factorization.

631790690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63179076.

The product of its (nonzero) digits is 61236, while the sum is 41.

The square root of 631790690 is about 25135.4468828386. The cubic root of 631790690 is about 858.0733369900.

The spelling of 631790690 in words is "six hundred thirty-one million, seven hundred ninety thousand, six hundred ninety".