78222287 has 32 divisors (see below), whose sum is σ = 101606400. Its totient is φ = 59051520.

The previous prime is 78222283. The next prime is 78222293.

78222287 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 78222287 - 2² = 78222283 is a prime.

It is a super-2 number, since 2×78222287² = 12237452367020738, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78222287.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78222281) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55214 + ... + 56612.

It is an arithmetic number, because the mean of its divisors is an integer number (3175200).

Almost surely, 2^78222287 is an apocalyptic number.

78222287 is a deficient number, since it is larger than the sum of its proper divisors (23384113).

78222287 is a wasteful number, since it uses less digits than its factorization.

78222287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1463.

The product of its digits is 50176, while the sum is 38.

The square root of 78222287 is about 8844.3364363868. The cubic root of 78222287 is about 427.6713620545.

The spelling of 78222287 in words is "seventy-eight million, two hundred twenty-two thousand, two hundred eighty-seven".