690746724864 has 600 divisors, whose sum is σ = 2407719967488. Its totient is φ = 197157058560.

The previous prime is 690746724847. The next prime is 690746724883. The reversal of 690746724864 is 468427647096.

690746724864 is a `hidden beast` number, since 6 + 90 + 7 + 4 + 67 + 2 + 486 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 697019409 + ... + 697020399.

Almost surely, 2^690746724864 is an apocalyptic number.

690746724864 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 690746724864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1203859983744).

690746724864 is an abundant number, since it is smaller than the sum of its proper divisors (1716973242624).

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

690746724864 is an frugal number, since it uses more digits than its factorization.

690746724864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056 (or 1003 counting only the distinct ones).

The product of its (nonzero) digits is 97542144, while the sum is 63.

The spelling of 690746724864 in words is "six hundred ninety billion, seven hundred forty-six million, seven hundred twenty-four thousand, eight hundred sixty-four".