82278251 has 4 divisors (see below), whose sum is σ = 89758104. Its totient is φ = 74798400.

The previous prime is 82278241. The next prime is 82278253. The reversal of 82278251 is 15287228.

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

It is a cyclic number.

It is not a de Polignac number, because 82278251 - 2⁶ = 82278187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82278253) 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, 3739910 + ... + 3739931.

It is an arithmetic number, because the mean of its divisors is an integer number (22439526).

Almost surely, 2^82278251 is an apocalyptic number.

82278251 is a deficient number, since it is larger than the sum of its proper divisors (7479853).

82278251 is a wasteful number, since it uses less digits than its factorization.

82278251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7479852.

The product of its digits is 17920, while the sum is 35.

The square root of 82278251 is about 9070.7359679356. The cubic root of 82278251 is about 434.9389988006.

The spelling of 82278251 in words is "eighty-two million, two hundred seventy-eight thousand, two hundred fifty-one".