81474305 has 16 divisors (see below), whose sum is σ = 106869888. Its totient is φ = 59136000.

The previous prime is 81474301. The next prime is 81474313. The reversal of 81474305 is 50347418.

It is not a de Polignac number, because 81474305 - 2² = 81474301 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81474301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34100 + ... + 36410.

It is an arithmetic number, because the mean of its divisors is an integer number (6679368).

Almost surely, 2^81474305 is an apocalyptic number.

It is an amenable number.

81474305 is a deficient number, since it is larger than the sum of its proper divisors (25395583).

81474305 is a wasteful number, since it uses less digits than its factorization.

81474305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2968.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 81474305 is about 9026.3118160188. The cubic root of 81474305 is about 433.5177541777.

The spelling of 81474305 in words is "eighty-one million, four hundred seventy-four thousand, three hundred five".