82278561 has 8 divisors (see below), whose sum is σ = 109787040. Its totient is φ = 54811232.

The previous prime is 82278551. The next prime is 82278587. The reversal of 82278561 is 16587228.

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 82278561 - 2¹⁰ = 82277537 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (82278551) 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, 5271 + ... + 13868.

It is an arithmetic number, because the mean of its divisors is an integer number (13723380).

Almost surely, 2^82278561 is an apocalyptic number.

It is an amenable number.

82278561 is a deficient number, since it is larger than the sum of its proper divisors (27508479).

82278561 is a wasteful number, since it uses less digits than its factorization.

82278561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20575.

The product of its digits is 53760, while the sum is 39.

The square root of 82278561 is about 9070.7530558383. The cubic root of 82278561 is about 434.9395450402.

The spelling of 82278561 in words is "eighty-two million, two hundred seventy-eight thousand, five hundred sixty-one".