77221725 has 24 divisors (see below), whose sum is σ = 145913280. Its totient is φ = 35301120.

The previous prime is 77221723. The next prime is 77221733. The reversal of 77221725 is 52712277.

It is not a de Polignac number, because 77221725 - 2¹ = 77221723 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77221723) 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, 73020 + ... + 74069.

It is an arithmetic number, because the mean of its divisors is an integer number (6079720).

Almost surely, 2^77221725 is an apocalyptic number.

77221725 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

77221725 is a deficient number, since it is larger than the sum of its proper divisors (68691555).

77221725 is a wasteful number, since it uses less digits than its factorization.

77221725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147109 (or 147104 counting only the distinct ones).

The product of its digits is 13720, while the sum is 33.

The square root of 77221725 is about 8787.5892598596. The cubic root of 77221725 is about 425.8400455265.

The spelling of 77221725 in words is "seventy-seven million, two hundred twenty-one thousand, seven hundred twenty-five".