81998034 has 16 divisors (see below), whose sum is σ = 172627680. Its totient is φ = 25894080.

The previous prime is 81998027. The next prime is 81998039. The reversal of 81998034 is 43089918.

It is not an unprimeable number, because it can be changed into a prime (81998039) 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, 359527 + ... + 359754.

It is an arithmetic number, because the mean of its divisors is an integer number (10789230).

Almost surely, 2^81998034 is an apocalyptic number.

81998034 is an abundant number, since it is smaller than the sum of its proper divisors (90629646).

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

81998034 is a wasteful number, since it uses less digits than its factorization.

81998034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719305.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 81998034 is about 9055.2765832966. The cubic root of 81998034 is about 434.4446764960. Note that the first 3 decimals are identical.

The spelling of 81998034 in words is "eighty-one million, nine hundred ninety-eight thousand, thirty-four".