77712473 has 4 divisors (see below), whose sum is σ = 78400308. Its totient is φ = 77024640.

The previous prime is 77712461. The next prime is 77712493. The reversal of 77712473 is 37421777.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37421777 = 17 ⋅2201281.

It can be written as a sum of positive squares in 2 ways, for example, as 22165264 + 55547209 = 4708^2 + 7453^2 .

It is a cyclic number.

It is not a de Polignac number, because 77712473 - 2⁶ = 77712409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77712403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 343748 + ... + 343973.

It is an arithmetic number, because the mean of its divisors is an integer number (19600077).

Almost surely, 2^77712473 is an apocalyptic number.

It is an amenable number.

77712473 is a deficient number, since it is larger than the sum of its proper divisors (687835).

77712473 is a wasteful number, since it uses less digits than its factorization.

77712473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687834.

The product of its digits is 57624, while the sum is 38.

The square root of 77712473 is about 8815.4678264968. The cubic root of 77712473 is about 426.7402197278.

The spelling of 77712473 in words is "seventy-seven million, seven hundred twelve thousand, four hundred seventy-three".