87807640 has 16 divisors (see below), whose sum is σ = 197567280. Its totient is φ = 35123040.

The previous prime is 87807589. The next prime is 87807641. The reversal of 87807640 is 4670878.

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 2195191 = 87807640 / (8 + 7 + 8 + 0 + 7 + 6 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 87807593 and 87807602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87807641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1097556 + ... + 1097635.

It is an arithmetic number, because the mean of its divisors is an integer number (12347955).

Almost surely, 2^87807640 is an apocalyptic number.

It is an amenable number.

87807640 is an abundant number, since it is smaller than the sum of its proper divisors (109759640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87807640 is a wasteful number, since it uses less digits than its factorization.

87807640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2195202 (or 2195198 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 40.

The square root of 87807640 is about 9370.5730881307. The cubic root of 87807640 is about 444.4716871264.

The spelling of 87807640 in words is "eighty-seven million, eight hundred seven thousand, six hundred forty".