78124312 has 16 divisors (see below), whose sum is σ = 167409360. Its totient is φ = 33481824.

The previous prime is 78124303. The next prime is 78124313. The reversal of 78124312 is 21342187.

It is a super-2 number, since 2×78124312² = 12206816250946688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78124313) 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, 697483 + ... + 697594.

It is an arithmetic number, because the mean of its divisors is an integer number (10463085).

Almost surely, 2^78124312 is an apocalyptic number.

It is an amenable number.

78124312 is an abundant number, since it is smaller than the sum of its proper divisors (89285048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78124312 is a wasteful number, since it uses less digits than its factorization.

78124312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1395090 (or 1395086 counting only the distinct ones).

The product of its digits is 2688, while the sum is 28.

The square root of 78124312 is about 8838.7958455889. The cubic root of 78124312 is about 427.4927317711.

Adding to 78124312 its reverse (21342187), we get a palindrome (99466499).

The spelling of 78124312 in words is "seventy-eight million, one hundred twenty-four thousand, three hundred twelve".