689698657440 has 576 divisors, whose sum is σ = 2684536598016. Its totient is φ = 166154084352.

The previous prime is 689698657429. The next prime is 689698657477. The reversal of 689698657440 is 44756896986.

689698657440 is a `hidden beast` number, since 6 + 8 + 9 + 6 + 9 + 8 + 6 + 574 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 23741164 + ... + 23770196.

It is an arithmetic number, because the mean of its divisors is an integer number (4660653816).

Almost surely, 2^689698657440 is an apocalyptic number.

689698657440 is a gapful number since it is divisible by the number (60) 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 689698657440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1342268299008).

689698657440 is an abundant number, since it is smaller than the sum of its proper divisors (1994837940576).

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

689698657440 is a wasteful number, since it uses less digits than its factorization.

689698657440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29123 (or 29103 counting only the distinct ones).

The product of its (nonzero) digits is 627056640, while the sum is 72.

The spelling of 689698657440 in words is "six hundred eighty-nine billion, six hundred ninety-eight million, six hundred fifty-seven thousand, four hundred forty".