81574875 has 48 divisors (see below), whose sum is σ = 149666400. Its totient is φ = 42734400.

The previous prime is 81574861. The next prime is 81574877. The reversal of 81574875 is 57847518.

It is a happy number.

81574875 is a `hidden beast` number, since 8 + 1 + 574 + 8 + 75 = 666.

It is not a de Polignac number, because 81574875 - 2¹² = 81570779 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 81574875.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81574877) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 65761 + ... + 66989.

It is an arithmetic number, because the mean of its divisors is an integer number (3118050).

Almost surely, 2^81574875 is an apocalyptic number.

81574875 is a deficient number, since it is larger than the sum of its proper divisors (68091525).

81574875 is a wasteful number, since it uses less digits than its factorization.

81574875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1309 (or 1296 counting only the distinct ones).

The product of its digits is 313600, while the sum is 45.

The square root of 81574875 is about 9031.8810333175. The cubic root of 81574875 is about 433.6960556012.

The spelling of 81574875 in words is "eighty-one million, five hundred seventy-four thousand, eight hundred seventy-five".