77320477 has 4 divisors (see below), whose sum is σ = 83268220. Its totient is φ = 71372736.

The previous prime is 77320469. The next prime is 77320487. The reversal of 77320477 is 77402377.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4968441 + 72352036 = 2229^2 + 8506^2 .

It is a cyclic number.

It is not a de Polignac number, because 77320477 - 2³ = 77320469 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 (77320427) 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, 2973852 + ... + 2973877.

It is an arithmetic number, because the mean of its divisors is an integer number (20817055).

Almost surely, 2^77320477 is an apocalyptic number.

It is an amenable number.

77320477 is a deficient number, since it is larger than the sum of its proper divisors (5947743).

77320477 is a wasteful number, since it uses less digits than its factorization.

77320477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5947742.

The product of its (nonzero) digits is 57624, while the sum is 37.

The square root of 77320477 is about 8793.2062980462. The cubic root of 77320477 is about 426.0214911976.

The spelling of 77320477 in words is "seventy-seven million, three hundred twenty thousand, four hundred seventy-seven".