187990809408 has 42 divisors (see below), whose sum is σ = 538841714034. Its totient is φ = 62663602944.

The previous prime is 187990809401. The next prime is 187990809431. The reversal of 187990809408 is 804908099781.

It can be written as a sum of positive squares in only one way, i.e., 160987117824 + 27003691584 = 401232^2 + 164328^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (187990809401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 163185891 + ... + 163187042.

Almost surely, 2^187990809408 is an apocalyptic number.

187990809408 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

187990809408 is an abundant number, since it is smaller than the sum of its proper divisors (350850904626).

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

187990809408 is a wasteful number, since it uses less digits than its factorization.

187990809408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326372951 (or 326372938 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 63.

The spelling of 187990809408 in words is "one hundred eighty-seven billion, nine hundred ninety million, eight hundred nine thousand, four hundred eight".