81474907 has 8 divisors (see below), whose sum is σ = 86173760. Its totient is φ = 76817160.

The previous prime is 81474889. The next prime is 81474917. The reversal of 81474907 is 70947418.

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

It is a cyclic number.

It is not a de Polignac number, because 81474907 - 2¹⁹ = 80950619 is a prime.

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

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81474907.

It is not an unprimeable number, because it can be changed into a prime (81474917) 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, 6153 + ... + 14170.

It is an arithmetic number, because the mean of its divisors is an integer number (10771720).

Almost surely, 2^81474907 is an apocalyptic number.

81474907 is a deficient number, since it is larger than the sum of its proper divisors (4698853).

81474907 is a wasteful number, since it uses less digits than its factorization.

81474907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20553.

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

The square root of 81474907 is about 9026.3451629106. The cubic root of 81474907 is about 433.5188219051.

The spelling of 81474907 in words is "eighty-one million, four hundred seventy-four thousand, nine hundred seven".