1538021628900 has 243 divisors, whose sum is σ = 4901814733179. Its totient is φ = 403362812160.

The previous prime is 1538021628883. The next prime is 1538021628911. The reversal of 1538021628900 is 98261208351.

The square root of 1538021628900 is 1240170.

It is a perfect power (a square), and thus also a powerful number.

1538021628900 is a `hidden beast` number, since 1 + 538 + 0 + 2 + 1 + 6 + 28 + 90 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 724258869156 + 813762759744 = 851034^2 + 902088^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 2492741392 + ... + 2492742008.

Almost surely, 2^{1538021628900} is an apocalyptic number.

1538021628900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1538021628900 is the 1240170-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1538021628900

1538021628900 is an abundant number, since it is smaller than the sum of its proper divisors (3363793104279).

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

1538021628900 is an equidigital number, since it uses as much as digits as its factorization.

1538021628900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1388 (or 694 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The spelling of 1538021628900 in words is "one trillion, five hundred thirty-eight billion, twenty-one million, six hundred twenty-eight thousand, nine hundred".