77921451 has 12 divisors (see below), whose sum is σ = 118477320. Its totient is φ = 49213440.

The previous prime is 77921429. The next prime is 77921471. The reversal of 77921451 is 15412977.

It is a happy number.

It is not a de Polignac number, because 77921451 - 2⁵ = 77921419 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77921411) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 227670 + ... + 228011.

It is an arithmetic number, because the mean of its divisors is an integer number (9873110).

Almost surely, 2^77921451 is an apocalyptic number.

77921451 is a deficient number, since it is larger than the sum of its proper divisors (40555869).

77921451 is a wasteful number, since it uses less digits than its factorization.

77921451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455706 (or 455703 counting only the distinct ones).

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

The square root of 77921451 is about 8827.3127847607. The cubic root of 77921451 is about 427.1223956107.

The spelling of 77921451 in words is "seventy-seven million, nine hundred twenty-one thousand, four hundred fifty-one".