77923477 has 2 divisors, whose sum is σ = 77923478. Its totient is φ = 77923476.

The previous prime is 77923459. The next prime is 77923511. The reversal of 77923477 is 77432977.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75585636 + 2337841 = 8694^2 + 1529^2 .

It is a cyclic number.

It is not a de Polignac number, because 77923477 - 2¹¹ = 77921429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77923177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38961738 + 38961739.

It is an arithmetic number, because the mean of its divisors is an integer number (38961739).

Almost surely, 2^77923477 is an apocalyptic number.

It is an amenable number.

77923477 is a deficient number, since it is larger than the sum of its proper divisors (1).

77923477 is an equidigital number, since it uses as much as digits as its factorization.

77923477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 518616, while the sum is 46.

The square root of 77923477 is about 8827.4275414755. The cubic root of 77923477 is about 427.1260973833.

It can be divided in two parts, 77923 and 477, that added together give a square (78400 = 280²).

The spelling of 77923477 in words is "seventy-seven million, nine hundred twenty-three thousand, four hundred seventy-seven".