77625220 has 24 divisors (see below), whose sum is σ = 164697624. Its totient is φ = 30729216.

The previous prime is 77625193. The next prime is 77625221. The reversal of 77625220 is 2252677.

It can be written as a sum of positive squares in 4 ways, for example, as 5171076 + 72454144 = 2274^2 + 8512^2 .

It is a hoax number, since the sum of its digits (31) 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 (77625221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18067 + ... + 21946.

It is an arithmetic number, because the mean of its divisors is an integer number (6862401).

Almost surely, 2^77625220 is an apocalyptic number.

It is an amenable number.

77625220 is an abundant number, since it is smaller than the sum of its proper divisors (87072404).

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

77625220 is a wasteful number, since it uses less digits than its factorization.

77625220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40119 (or 40117 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 31.

The square root of 77625220 is about 8810.5175784400. The cubic root of 77625220 is about 426.5804499730.

Adding to 77625220 its reverse (2252677), we get a palindrome (79877897).

The spelling of 77625220 in words is "seventy-seven million, six hundred twenty-five thousand, two hundred twenty".