18772847924 has 24 divisors (see below), whose sum is σ = 34841805768. Its totient is φ = 8819850240.

The previous prime is 18772847911. The next prime is 18772847969. The reversal of 18772847924 is 42974827781.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 776625424 + 17996222500 = 27868^2 + 134150^2 .

It is a super-2 number, since 2×18772847924² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183497 + ... + 266864.

It is an arithmetic number, because the mean of its divisors is an integer number (1451741907).

Almost surely, 2^18772847924 is an apocalyptic number.

It is an amenable number.

18772847924 is a deficient number, since it is larger than the sum of its proper divisors (16068957844).

18772847924 is a wasteful number, since it uses less digits than its factorization.

18772847924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450995 (or 450993 counting only the distinct ones).

The product of its digits is 12644352, while the sum is 59.

The spelling of 18772847924 in words is "eighteen billion, seven hundred seventy-two million, eight hundred forty-seven thousand, nine hundred twenty-four".