77187225 has 24 divisors (see below), whose sum is σ = 135125280. Its totient is φ = 38744320.

The previous prime is 77187223. The next prime is 77187247. The reversal of 77187225 is 52278177.

It is not a de Polignac number, because 77187225 - 2¹ = 77187223 is a prime.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (77187221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28995 + ... + 31544.

It is an arithmetic number, because the mean of its divisors is an integer number (5630220).

Almost surely, 2^77187225 is an apocalyptic number.

77187225 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

77187225 is a deficient number, since it is larger than the sum of its proper divisors (57938055).

77187225 is a wasteful number, since it uses less digits than its factorization.

77187225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60569 (or 60564 counting only the distinct ones).

The product of its digits is 54880, while the sum is 39.

The square root of 77187225 is about 8785.6260448530. The cubic root of 77187225 is about 425.7766192045.

The spelling of 77187225 in words is "seventy-seven million, one hundred eighty-seven thousand, two hundred twenty-five".