78222137 has 16 divisors (see below), whose sum is σ = 91929600. Its totient is φ = 65160960.

The previous prime is 78222127. The next prime is 78222139. The reversal of 78222137 is 73122287.

It is a cyclic number.

It is not a de Polignac number, because 78222137 - 2⁴ = 78222121 is a prime.

It is a super-2 number, since 2×78222137² = 12237405433693538, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78222139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137189 + ... + 137757.

It is an arithmetic number, because the mean of its divisors is an integer number (5745600).

Almost surely, 2^78222137 is an apocalyptic number.

It is an amenable number.

78222137 is a deficient number, since it is larger than the sum of its proper divisors (13707463).

78222137 is a wasteful number, since it uses less digits than its factorization.

78222137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1096.

The product of its digits is 9408, while the sum is 32.

The square root of 78222137 is about 8844.3279563797. The cubic root of 78222137 is about 427.6710886851.

The spelling of 78222137 in words is "seventy-eight million, two hundred twenty-two thousand, one hundred thirty-seven".