77320173 has 16 divisors (see below), whose sum is σ = 117948416. Its totient is φ = 44135280.

The previous prime is 77320153. The next prime is 77320183. The reversal of 77320173 is 37102377.

It is not a de Polignac number, because 77320173 - 2⁵ = 77320141 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77320173.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77320153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29640 + ... + 32142.

It is an arithmetic number, because the mean of its divisors is an integer number (7371776).

Almost surely, 2^77320173 is an apocalyptic number.

It is an amenable number.

77320173 is a deficient number, since it is larger than the sum of its proper divisors (40628243).

77320173 is a wasteful number, since it uses less digits than its factorization.

77320173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3984.

The product of its (nonzero) digits is 6174, while the sum is 30.

The square root of 77320173 is about 8793.1890119569. The cubic root of 77320173 is about 426.0209328690.

The spelling of 77320173 in words is "seventy-seven million, three hundred twenty thousand, one hundred seventy-three".