102991870 has 16 divisors (see below), whose sum is σ = 185513328. Its totient is φ = 41168320.

The previous prime is 102991849. The next prime is 102991871. The reversal of 102991870 is 78199201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102991871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17730 + ... + 22810.

It is an arithmetic number, because the mean of its divisors is an integer number (11594583).

Almost surely, 2^102991870 is an apocalyptic number.

102991870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

102991870 is a deficient number, since it is larger than the sum of its proper divisors (82521458).

102991870 is a wasteful number, since it uses less digits than its factorization.

102991870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7115.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 102991870 is about 10148.4910208365. The cubic root of 102991870 is about 468.7424811831.

The spelling of 102991870 in words is "one hundred two million, nine hundred ninety-one thousand, eight hundred seventy".