791091640 has 32 divisors (see below), whose sum is σ = 1821354480. Its totient is φ = 309076992.

The previous prime is 791091611. The next prime is 791091671. The reversal of 791091640 is 46190197.

It is a self number, because there is not a number n which added to its sum of digits gives 791091640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 228249 + ... + 231688.

Almost surely, 2^791091640 is an apocalyptic number.

It is an amenable number.

791091640 is an abundant number, since it is smaller than the sum of its proper divisors (1030262840).

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

791091640 is a wasteful number, since it uses less digits than its factorization.

791091640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459991 (or 459987 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 791091640 is about 28126.3513453132. The cubic root of 791091640 is about 924.8591516734.

The spelling of 791091640 in words is "seven hundred ninety-one million, ninety-one thousand, six hundred forty".