81879354 has 48 divisors (see below), whose sum is σ = 184597920. Its totient is φ = 26197920.

The previous prime is 81879331. The next prime is 81879373. The reversal of 81879354 is 45397818.

It is a super-2 number, since 2×81879354² = 13408457222914632, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 118149 + ... + 118839.

It is an arithmetic number, because the mean of its divisors is an integer number (3845790).

Almost surely, 2^81879354 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81879354, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92298960).

81879354 is an abundant number, since it is smaller than the sum of its proper divisors (102718566).

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

81879354 is a wasteful number, since it uses less digits than its factorization.

81879354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 955 (or 952 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 81879354 is about 9048.7211251093. The cubic root of 81879354 is about 434.2349772028.

The spelling of 81879354 in words is "eighty-one million, eight hundred seventy-nine thousand, three hundred fifty-four".