82981575 has 36 divisors (see below), whose sum is σ = 153436608. Its totient is φ = 42825600.

The previous prime is 82981567. The next prime is 82981579. The reversal of 82981575 is 57518928.

It is a happy number.

It is not a de Polignac number, because 82981575 - 2³ = 82981567 is a prime.

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

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 82981575.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82981579) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1027 + ... + 12923.

It is an arithmetic number, because the mean of its divisors is an integer number (4262128).

Almost surely, 2^82981575 is an apocalyptic number.

82981575 is a deficient number, since it is larger than the sum of its proper divisors (70455033).

82981575 is a wasteful number, since it uses less digits than its factorization.

82981575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11944 (or 11936 counting only the distinct ones).

The product of its digits is 201600, while the sum is 45.

The square root of 82981575 is about 9109.4223197742. The cubic root of 82981575 is about 436.1747871856.

The spelling of 82981575 in words is "eighty-two million, nine hundred eighty-one thousand, five hundred seventy-five".