77824012 has 24 divisors (see below), whose sum is σ = 160670720. Its totient is φ = 32276880.

The previous prime is 77823979. The next prime is 77824031. The reversal of 77824012 is 21042877.

It is a super-2 number, since 2×77824012² = 12113153687552288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43962 + ... + 45697.

Almost surely, 2^77824012 is an apocalyptic number.

It is an amenable number.

77824012 is an abundant number, since it is smaller than the sum of its proper divisors (82846708).

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

77824012 is a wasteful number, since it uses less digits than its factorization.

77824012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89701 (or 89699 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 77824012 is about 8821.7918814717. The cubic root of 77824012 is about 426.9442857396.

Adding to 77824012 its reverse (21042877), we get a palindrome (98866889).

The spelling of 77824012 in words is "seventy-seven million, eight hundred twenty-four thousand, twelve".