82154779 has 4 divisors (see below), whose sum is σ = 93891184. Its totient is φ = 70418376.

The previous prime is 82154773. The next prime is 82154789. The reversal of 82154779 is 97745128.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-82154779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82154773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5868192 + ... + 5868205.

It is an arithmetic number, because the mean of its divisors is an integer number (23472796).

Almost surely, 2^82154779 is an apocalyptic number.

82154779 is a deficient number, since it is larger than the sum of its proper divisors (11736405).

82154779 is a wasteful number, since it uses less digits than its factorization.

82154779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11736404.

The product of its digits is 141120, while the sum is 43.

The square root of 82154779 is about 9063.9273496647. The cubic root of 82154779 is about 434.7213241292.

The spelling of 82154779 in words is "eighty-two million, one hundred fifty-four thousand, seven hundred seventy-nine".