78120212 has 12 divisors (see below), whose sum is σ = 137143860. Its totient is φ = 38936256.

The previous prime is 78120197. The next prime is 78120233. The reversal of 78120212 is 21202187.

It can be written as a sum of positive squares in 2 ways, for example, as 5597956 + 72522256 = 2366^2 + 8516^2 .

It is a super-2 number, since 2×78120212² = 12205535045849888, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29537 + ... + 32072.

It is an arithmetic number, because the mean of its divisors is an integer number (11428655).

Almost surely, 2^78120212 is an apocalyptic number.

It is an amenable number.

78120212 is a deficient number, since it is larger than the sum of its proper divisors (59023648).

78120212 is a wasteful number, since it uses less digits than its factorization.

78120212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61930 (or 61928 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 78120212 is about 8838.5639105004. The cubic root of 78120212 is about 427.4852533016.

Adding to 78120212 its reverse (21202187), we get a palindrome (99322399).

The spelling of 78120212 in words is "seventy-eight million, one hundred twenty thousand, two hundred twelve".