77320540 has 24 divisors (see below), whose sum is σ = 177134832. Its totient is φ = 28116480.

The previous prime is 77320531. The next prime is 77320561. The reversal of 77320540 is 4502377.

It is a junction number, because it is equal to n+sod(n) for n = 77320499 and 77320508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175509 + ... + 175948.

It is an arithmetic number, because the mean of its divisors is an integer number (7380618).

Almost surely, 2^77320540 is an apocalyptic number.

It is an amenable number.

77320540 is an abundant number, since it is smaller than the sum of its proper divisors (99814292).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77320540 is a wasteful number, since it uses less digits than its factorization.

77320540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351477 (or 351475 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 28.

The square root of 77320540 is about 8793.2098803565. The cubic root of 77320540 is about 426.0216069037.

The spelling of 77320540 in words is "seventy-seven million, three hundred twenty thousand, five hundred forty".