766400631 has 8 divisors (see below), whose sum is σ = 1054831104. Its totient is φ = 494451960.

The previous prime is 766400599. The next prime is 766400671. The reversal of 766400631 is 136004667.

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

It is not a de Polignac number, because 766400631 - 2⁵ = 766400599 is a prime.

It is a super-2 number, since 2×766400631² = 1174739854394396322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 766400592 and 766400601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (766400671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4120341 + ... + 4120526.

It is an arithmetic number, because the mean of its divisors is an integer number (131853888).

Almost surely, 2^766400631 is an apocalyptic number.

766400631 is a deficient number, since it is larger than the sum of its proper divisors (288430473).

766400631 is a wasteful number, since it uses less digits than its factorization.

766400631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8240901.

The product of its (nonzero) digits is 18144, while the sum is 33.

The square root of 766400631 is about 27683.9417532981. The cubic root of 766400631 is about 915.1352506928.

The spelling of 766400631 in words is "seven hundred sixty-six million, four hundred thousand, six hundred thirty-one".