87780987 has 24 divisors (see below), whose sum is σ = 145208544. Its totient is φ = 50056704.

The previous prime is 87780977. The next prime is 87780991. The reversal of 87780987 is 78908778.

It is not a de Polignac number, because 87780987 - 2⁶ = 87780923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87780907) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37483 + ... + 39755.

It is an arithmetic number, because the mean of its divisors is an integer number (6050356).

Almost surely, 2^87780987 is an apocalyptic number.

87780987 is a deficient number, since it is larger than the sum of its proper divisors (57427557).

87780987 is a wasteful number, since it uses less digits than its factorization.

87780987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2899 (or 2896 counting only the distinct ones).

The product of its (nonzero) digits is 1580544, while the sum is 54.

The square root of 87780987 is about 9369.1508153087. The cubic root of 87780987 is about 444.4267111512.

The spelling of 87780987 in words is "eighty-seven million, seven hundred eighty thousand, nine hundred eighty-seven".