187900028644 has 48 divisors (see below), whose sum is σ = 339109581888. Its totient is φ = 91048422528.

The previous prime is 187900028639. The next prime is 187900028663. The reversal of 187900028644 is 446820009781.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12631299 + ... + 12646165.

It is an arithmetic number, because the mean of its divisors is an integer number (7064782956).

Almost surely, 2^187900028644 is an apocalyptic number.

It is an amenable number.

187900028644 is a deficient number, since it is larger than the sum of its proper divisors (151209553244).

187900028644 is a wasteful number, since it uses less digits than its factorization.

187900028644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15484 (or 15482 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 49.

The spelling of 187900028644 in words is "one hundred eighty-seven billion, nine hundred million, twenty-eight thousand, six hundred forty-four".