81900102 has 16 divisors (see below), whose sum is σ = 170922240. Its totient is φ = 26113032.

The previous prime is 81900097. The next prime is 81900113. The reversal of 81900102 is 20100918.

It is a super-2 number, since 2×81900102² = 13415253415220808, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 296602 + ... + 296877.

It is an arithmetic number, because the mean of its divisors is an integer number (10682640).

Almost surely, 2^81900102 is an apocalyptic number.

81900102 is an abundant number, since it is smaller than the sum of its proper divisors (89022138).

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

81900102 is a wasteful number, since it uses less digits than its factorization.

81900102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593507.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 81900102 is about 9049.8675128424. The cubic root of 81900102 is about 434.2716520827.

The spelling of 81900102 in words is "eighty-one million, nine hundred thousand, one hundred two".