78222945 has 16 divisors (see below), whose sum is σ = 126060480. Its totient is φ = 41417664.

The previous prime is 78222883. The next prime is 78222953. The reversal of 78222945 is 54922287.

It is not a de Polignac number, because 78222945 - 2⁷ = 78222817 is a prime.

It is a super-2 number, since 2×78222945² = 12237658248946050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16674 + ... + 20843.

It is an arithmetic number, because the mean of its divisors is an integer number (7878780).

Almost surely, 2^78222945 is an apocalyptic number.

It is an amenable number.

78222945 is a deficient number, since it is larger than the sum of its proper divisors (47837535).

78222945 is a wasteful number, since it uses less digits than its factorization.

78222945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37664.

The product of its digits is 80640, while the sum is 39.

The square root of 78222945 is about 8844.3736352554. The cubic root of 78222945 is about 427.6725612309.

The spelling of 78222945 in words is "seventy-eight million, two hundred twenty-two thousand, nine hundred forty-five".