15787990889 has 16 divisors (see below), whose sum is σ = 17381547456. Its totient is φ = 14221396800.

The previous prime is 15787990879. The next prime is 15787990927. The reversal of 15787990889 is 98809978751.

It is a cyclic number.

It is not a de Polignac number, because 15787990889 - 2¹² = 15787986793 is a prime.

It is a super-2 number, since 2×15787990889² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15787990859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 537194 + ... + 565820.

It is an arithmetic number, because the mean of its divisors is an integer number (1086346716).

Almost surely, 2^15787990889 is an apocalyptic number.

It is an amenable number.

15787990889 is a deficient number, since it is larger than the sum of its proper divisors (1593556567).

15787990889 is a wasteful number, since it uses less digits than its factorization.

15787990889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29096.

The product of its (nonzero) digits is 91445760, while the sum is 71.

The spelling of 15787990889 in words is "fifteen billion, seven hundred eighty-seven million, nine hundred ninety thousand, eight hundred eighty-nine".