17990385870 has 32 divisors (see below), whose sum is σ = 45054185472. Its totient is φ = 4588851872.

The previous prime is 17990385869. The next prime is 17990385877. The reversal of 17990385870 is 7858309971.

It is a self number, because there is not a number n which added to its sum of digits gives 17990385870.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17990385877) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13035822 + ... + 13037201.

It is an arithmetic number, because the mean of its divisors is an integer number (1407943296).

Almost surely, 2^17990385870 is an apocalyptic number.

17990385870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

17990385870 is an abundant number, since it is smaller than the sum of its proper divisors (27063799602).

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

17990385870 is a wasteful number, since it uses less digits than its factorization.

17990385870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26073056.

The product of its (nonzero) digits is 3810240, while the sum is 57.

The spelling of 17990385870 in words is "seventeen billion, nine hundred ninety million, three hundred eighty-five thousand, eight hundred seventy".