81554074 has 8 divisors (see below), whose sum is σ = 139807008. Its totient is φ = 34951740.

The previous prime is 81554069. The next prime is 81554089. The reversal of 81554074 is 47045518.

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, 2912632 + ... + 2912659.

It is an arithmetic number, because the mean of its divisors is an integer number (17475876).

Almost surely, 2^81554074 is an apocalyptic number.

81554074 is a deficient number, since it is larger than the sum of its proper divisors (58252934).

81554074 is a wasteful number, since it uses less digits than its factorization.

81554074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5825300.

The product of its (nonzero) digits is 22400, while the sum is 34.

The square root of 81554074 is about 9030.7294279034. The cubic root of 81554074 is about 433.6591893539.

The spelling of 81554074 in words is "eighty-one million, five hundred fifty-four thousand, seventy-four".