689690042490 has 64 divisors (see below), whose sum is σ = 1677032937216. Its totient is φ = 181509891072.

The previous prime is 689690042411. The next prime is 689690042567. The reversal of 689690042490 is 94240096986.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 689690042490.

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, 524482 + ... + 1286258.

It is an arithmetic number, because the mean of its divisors is an integer number (26203639644).

Almost surely, 2^689690042490 is an apocalyptic number.

689690042490 is an abundant number, since it is smaller than the sum of its proper divisors (987342894726).

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

689690042490 is a wasteful number, since it uses less digits than its factorization.

689690042490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762183.

The product of its (nonzero) digits is 6718464, while the sum is 57.

The spelling of 689690042490 in words is "six hundred eighty-nine billion, six hundred ninety million, forty-two thousand, four hundred ninety".