77173145 has 16 divisors (see below), whose sum is σ = 105980160. Its totient is φ = 52847424.

The previous prime is 77173139. The next prime is 77173169. The reversal of 77173145 is 54137177.

It is a de Polignac number, because none of the positive numbers 2^k-77173145 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49244 + ... + 50786.

It is an arithmetic number, because the mean of its divisors is an integer number (6623760).

Almost surely, 2^77173145 is an apocalyptic number.

It is an amenable number.

77173145 is a deficient number, since it is larger than the sum of its proper divisors (28807015).

77173145 is a wasteful number, since it uses less digits than its factorization.

77173145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2984.

The product of its digits is 20580, while the sum is 35.

The square root of 77173145 is about 8784.8246994462. The cubic root of 77173145 is about 425.7507284807.

The spelling of 77173145 in words is "seventy-seven million, one hundred seventy-three thousand, one hundred forty-five".