691088288040 has 64 divisors (see below), whose sum is σ = 2303627630400. Its totient is φ = 184290209856.

The previous prime is 691088288039. The next prime is 691088288071. The reversal of 691088288040 is 40882880196.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 319947202 + ... + 319949361.

It is an arithmetic number, because the mean of its divisors is an integer number (35994181725).

Almost surely, 2^691088288040 is an apocalyptic number.

691088288040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

691088288040 is an abundant number, since it is smaller than the sum of its proper divisors (1612539342360).

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

691088288040 is a wasteful number, since it uses less digits than its factorization.

691088288040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639896583 (or 639896573 counting only the distinct ones).

The product of its (nonzero) digits is 1769472, while the sum is 54.

The spelling of 691088288040 in words is "six hundred ninety-one billion, eighty-eight million, two hundred eighty-eight thousand, forty".