81935454 has 16 divisors (see below), whose sum is σ = 164047248. Its totient is φ = 27282432.

The previous prime is 81935443. The next prime is 81935471. The reversal of 81935454 is 45453918.

It is a super-2 number, since 2×81935454² = 13426837244372232, 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, 867 + ... + 12830.

It is an arithmetic number, because the mean of its divisors is an integer number (10252953).

Almost surely, 2^81935454 is an apocalyptic number.

81935454 is an abundant number, since it is smaller than the sum of its proper divisors (82111794).

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

81935454 is a wasteful number, since it uses less digits than its factorization.

81935454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14699.

The product of its digits is 86400, while the sum is 39.

The square root of 81935454 is about 9051.8204798814. The cubic root of 81935454 is about 434.3341272309.

The spelling of 81935454 in words is "eighty-one million, nine hundred thirty-five thousand, four hundred fifty-four".