691623456 has 48 divisors (see below), whose sum is σ = 1820397600. Its totient is φ = 229920768.

The previous prime is 691623451. The next prime is 691623521. The reversal of 691623456 is 654326196.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (691623451) 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, 26880 + ... + 45888.

It is an arithmetic number, because the mean of its divisors is an integer number (37924950).

Almost surely, 2^691623456 is an apocalyptic number.

It is an amenable number.

691623456 is an abundant number, since it is smaller than the sum of its proper divisors (1128774144).

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

691623456 is a wasteful number, since it uses less digits than its factorization.

691623456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19401 (or 19393 counting only the distinct ones).

The product of its digits is 233280, while the sum is 42.

The square root of 691623456 is about 26298.7348745144. The cubic root of 691623456 is about 884.3480812910.

The spelling of 691623456 in words is "six hundred ninety-one million, six hundred twenty-three thousand, four hundred fifty-six".