18772648 has 8 divisors (see below), whose sum is σ = 35198730. Its totient is φ = 9386320.

The previous prime is 18772643. The next prime is 18772651. The reversal of 18772648 is 84627781.

It can be written as a sum of positive squares in only one way, i.e., 13380964 + 5391684 = 3658^2 + 2322^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (18772643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1173283 + ... + 1173298.

Almost surely, 2^18772648 is an apocalyptic number.

It is an amenable number.

18772648 is a deficient number, since it is larger than the sum of its proper divisors (16426082).

18772648 is a wasteful number, since it uses less digits than its factorization.

18772648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2346587 (or 2346583 counting only the distinct ones).

The product of its digits is 150528, while the sum is 43.

The square root of 18772648 is about 4332.7413954678. The cubic root of 18772648 is about 265.7715641073.

The spelling of 18772648 in words is "eighteen million, seven hundred seventy-two thousand, six hundred forty-eight".