18772157620 has 24 divisors (see below), whose sum is σ = 40780895400. Its totient is φ = 7249936512.

The previous prime is 18772157597. The next prime is 18772157627. The reversal of 18772157620 is 2675127781.

It can be written as a sum of positive squares in 4 ways, for example, as 3414999844 + 15357157776 = 58438^2 + 123924^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18772157627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16182315 + ... + 16183474.

It is an arithmetic number, because the mean of its divisors is an integer number (1699203975).

Almost surely, 2^18772157620 is an apocalyptic number.

18772157620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18772157620 is an abundant number, since it is smaller than the sum of its proper divisors (22008737780).

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

18772157620 is a wasteful number, since it uses less digits than its factorization.

18772157620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32365827 (or 32365825 counting only the distinct ones).

The product of its (nonzero) digits is 329280, while the sum is 46.

The spelling of 18772157620 in words is "eighteen billion, seven hundred seventy-two million, one hundred fifty-seven thousand, six hundred twenty".