1638455248 has 10 divisors (see below), whose sum is σ = 3174507074. Its totient is φ = 819227616.

The previous prime is 1638455237. The next prime is 1638455249. The reversal of 1638455248 is 8425548361.

It can be written as a sum of positive squares in only one way, i.e., 1634423184 + 4032064 = 40428^2 + 2008^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1638455198 and 1638455207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1638455249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51201711 + ... + 51201742.

Almost surely, 2^1638455248 is an apocalyptic number.

It is an amenable number.

1638455248 is a deficient number, since it is larger than the sum of its proper divisors (1536051826).

1638455248 is a wasteful number, since it uses less digits than its factorization.

1638455248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102403461 (or 102403455 counting only the distinct ones).

The product of its digits is 921600, while the sum is 46.

The square root of 1638455248 is about 40477.8365034496. The cubic root of 1638455248 is about 1178.9033304168.

The spelling of 1638455248 in words is "one billion, six hundred thirty-eight million, four hundred fifty-five thousand, two hundred forty-eight".