15780086987 has 8 divisors (see below), whose sum is σ = 19095231456. Its totient is φ = 12730154112.

The previous prime is 15780086983. The next prime is 15780086989. The reversal of 15780086987 is 78968008751.

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 15780086987 - 2² = 15780086983 is a prime.

It is a super-2 number, since 2×15780086987² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (15780086983) 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, 66302768 + ... + 66303005.

It is an arithmetic number, because the mean of its divisors is an integer number (2386903932).

Almost surely, 2^15780086987 is an apocalyptic number.

15780086987 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

15780086987 is a deficient number, since it is larger than the sum of its proper divisors (3315144469).

15780086987 is a wasteful number, since it uses less digits than its factorization.

15780086987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132605797.

The product of its (nonzero) digits is 6773760, while the sum is 59.

The spelling of 15780086987 in words is "fifteen billion, seven hundred eighty million, eighty-six thousand, nine hundred eighty-seven".