81079898 has 8 divisors (see below), whose sum is σ = 121660320. Its totient is φ = 40526460.

The previous prime is 81079861. The next prime is 81079927. The reversal of 81079898 is 89897018.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4553 + ... + 13523.

It is an arithmetic number, because the mean of its divisors is an integer number (15207540).

Almost surely, 2^81079898 is an apocalyptic number.

81079898 is a deficient number, since it is larger than the sum of its proper divisors (40580422).

81079898 is a wasteful number, since it uses less digits than its factorization.

81079898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13492.

The product of its (nonzero) digits is 290304, while the sum is 50.

The square root of 81079898 is about 9004.4376837202. The cubic root of 81079898 is about 432.8170871275.

It can be divided in two parts, 810 and 79898, that added together give a palindrome (80708).

The spelling of 81079898 in words is "eighty-one million, seventy-nine thousand, eight hundred ninety-eight".