691704228840 has 128 divisors (see below), whose sum is σ = 2215916006400. Its totient is φ = 172348968960.

The previous prime is 691704228829. The next prime is 691704228877. The reversal of 691704228840 is 48822407196.

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, 3098017 + ... + 3313776.

It is an arithmetic number, because the mean of its divisors is an integer number (17311843800).

Almost surely, 2^691704228840 is an apocalyptic number.

691704228840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

691704228840 is an abundant number, since it is smaller than the sum of its proper divisors (1524211777560).

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

691704228840 is a wasteful number, since it uses less digits than its factorization.

691704228840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6411867 (or 6411863 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 51.

The spelling of 691704228840 in words is "six hundred ninety-one billion, seven hundred four million, two hundred twenty-eight thousand, eight hundred forty".