690683447664 has 400 divisors, whose sum is σ = 2316699221760. Its totient is φ = 194579573760.

The previous prime is 690683447653. The next prime is 690683447681. The reversal of 690683447664 is 466744386096.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 357680779 + ... + 357682709.

Almost surely, 2^690683447664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 690683447664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1158349610880).

690683447664 is an abundant number, since it is smaller than the sum of its proper divisors (1626015774096).

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

690683447664 is a wasteful number, since it uses less digits than its factorization.

690683447664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2490 (or 2475 counting only the distinct ones).

The product of its (nonzero) digits is 125411328, while the sum is 63.

The spelling of 690683447664 in words is "six hundred ninety billion, six hundred eighty-three million, four hundred forty-seven thousand, six hundred sixty-four".