77951412 has 144 divisors (see below), whose sum is σ = 250233984. Its totient is φ = 19872000.

The previous prime is 77951407. The next prime is 77951413. The reversal of 77951412 is 21415977.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77951413) 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 47 ways as a sum of consecutive naturals, for example, 168862 + ... + 169322.

It is an arithmetic number, because the mean of its divisors is an integer number (1737736).

Almost surely, 2^77951412 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77951412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125116992).

77951412 is an abundant number, since it is smaller than the sum of its proper divisors (172282572).

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

77951412 is a wasteful number, since it uses less digits than its factorization.

77951412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550 (or 545 counting only the distinct ones).

The product of its digits is 17640, while the sum is 36.

The square root of 77951412 is about 8829.0096839906. The cubic root of 77951412 is about 427.1771318188.

The spelling of 77951412 in words is "seventy-seven million, nine hundred fifty-one thousand, four hundred twelve".