87501987 has 12 divisors (see below), whose sum is σ = 126493744. Its totient is φ = 58287600.

The previous prime is 87501983. The next prime is 87501991. The reversal of 87501987 is 78910578.

It is an interprime number because it is at equal distance from previous prime (87501983) and next prime (87501991).

It is not a de Polignac number, because 87501987 - 2² = 87501983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87501983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10737 + ... + 17037.

Almost surely, 2^87501987 is an apocalyptic number.

87501987 is a deficient number, since it is larger than the sum of its proper divisors (38991757).

87501987 is a wasteful number, since it uses less digits than its factorization.

87501987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7850 (or 7847 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 45.

The square root of 87501987 is about 9354.2496759494. The cubic root of 87501987 is about 443.9553613511.

It can be divided in two parts, 87501 and 987, that added together give a palindrome (88488).

The spelling of 87501987 in words is "eighty-seven million, five hundred one thousand, nine hundred eighty-seven".