81409074 has 8 divisors (see below), whose sum is σ = 162818160. Its totient is φ = 27136356.

The previous prime is 81409063. The next prime is 81409117. The reversal of 81409074 is 47090418.

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

81409074 is an admirable number.

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, 6784084 + ... + 6784095.

It is an arithmetic number, because the mean of its divisors is an integer number (20352270).

Almost surely, 2^81409074 is an apocalyptic number.

81409074 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81409074 is a wasteful number, since it uses less digits than its factorization.

81409074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13568184.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 81409074 is about 9022.6977118820. The cubic root of 81409074 is about 433.4020271111.

The spelling of 81409074 in words is "eighty-one million, four hundred nine thousand, seventy-four".