77996415 has 32 divisors (see below), whose sum is σ = 143769600. Its totient is φ = 35368704.

The previous prime is 77996393. The next prime is 77996419. The reversal of 77996415 is 51469977.

It is a happy number.

It is not a de Polignac number, because 77996415 - 2⁵ = 77996383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77996419) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10411 + ... + 16259.

It is an arithmetic number, because the mean of its divisors is an integer number (4492800).

Almost surely, 2^77996415 is an apocalyptic number.

77996415 is a deficient number, since it is larger than the sum of its proper divisors (65773185).

77996415 is a wasteful number, since it uses less digits than its factorization.

77996415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5991.

The product of its digits is 476280, while the sum is 48.

The square root of 77996415 is about 8831.5579033373. The cubic root of 77996415 is about 427.2593221373.

The spelling of 77996415 in words is "seventy-seven million, nine hundred ninety-six thousand, four hundred fifteen".