77921263 has 16 divisors (see below), whose sum is σ = 93242880. Its totient is φ = 63667296.

The previous prime is 77921243. The next prime is 77921267. The reversal of 77921263 is 36212977.

It is not a de Polignac number, because 77921263 - 2⁹ = 77920751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77921267) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60381 + ... + 61657.

It is an arithmetic number, because the mean of its divisors is an integer number (5827680).

Almost surely, 2^77921263 is an apocalyptic number.

77921263 is a deficient number, since it is larger than the sum of its proper divisors (15321617).

77921263 is a wasteful number, since it uses less digits than its factorization.

77921263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686.

The product of its digits is 31752, while the sum is 37.

The square root of 77921263 is about 8827.3021359870. The cubic root of 77921263 is about 427.1220521063.

The spelling of 77921263 in words is "seventy-seven million, nine hundred twenty-one thousand, two hundred sixty-three".