81074479 has 8 divisors (see below), whose sum is σ = 87840720. Its totient is φ = 74530176.

The previous prime is 81074453. The next prime is 81074491. The reversal of 81074479 is 97447018.

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

It is not a de Polignac number, because 81074479 - 2⁷ = 81074351 is a prime.

It is a super-2 number, since 2×81074479² = 13146142290242882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81074419) 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, 54724 + ... + 56185.

It is an arithmetic number, because the mean of its divisors is an integer number (10980090).

Almost surely, 2^81074479 is an apocalyptic number.

81074479 is a deficient number, since it is larger than the sum of its proper divisors (6766241).

81074479 is a wasteful number, since it uses less digits than its factorization.

81074479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110969.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 81074479 is about 9004.1367715068. The cubic root of 81074479 is about 432.8074444248.

The spelling of 81074479 in words is "eighty-one million, seventy-four thousand, four hundred seventy-nine".