15990707987 has 8 divisors (see below), whose sum is σ = 16140648480. Its totient is φ = 15840826560.

The previous prime is 15990707927. The next prime is 15990708023. The reversal of 15990707987 is 78970709951.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15990707987 - 2⁸ = 15990707731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15990707917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 681818 + ... + 704880.

It is an arithmetic number, because the mean of its divisors is an integer number (2017581060).

Almost surely, 2^15990707987 is an apocalyptic number.

15990707987 is a deficient number, since it is larger than the sum of its proper divisors (149940493).

15990707987 is a wasteful number, since it uses less digits than its factorization.

15990707987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29533.

The product of its (nonzero) digits is 10001880, while the sum is 62.

The spelling of 15990707987 in words is "fifteen billion, nine hundred ninety million, seven hundred seven thousand, nine hundred eighty-seven".