77423215 has 4 divisors (see below), whose sum is σ = 92907864. Its totient is φ = 61938568.

The previous prime is 77423201. The next prime is 77423249. The reversal of 77423215 is 51232477.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51232477 = 23 ⋅2227499.

It is a cyclic number.

It is not a de Polignac number, because 77423215 - 2¹⁵ = 77390447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7742317 + ... + 7742326.

It is an arithmetic number, because the mean of its divisors is an integer number (23226966).

Almost surely, 2^77423215 is an apocalyptic number.

77423215 is a deficient number, since it is larger than the sum of its proper divisors (15484649).

77423215 is a wasteful number, since it uses less digits than its factorization.

77423215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15484648.

The product of its digits is 11760, while the sum is 31.

The square root of 77423215 is about 8799.0462551347. The cubic root of 77423215 is about 426.2100967969.

The spelling of 77423215 in words is "seventy-seven million, four hundred twenty-three thousand, two hundred fifteen".