87775740 has 72 divisors (see below), whose sum is σ = 286741728. Its totient is φ = 21605760.

The previous prime is 87775739. The next prime is 87775741. The reversal of 87775740 is 4757778.

It is a happy number.

87775740 is a `hidden beast` number, since 8 + 7 + 77 + 574 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (87775739) and next prime (87775741).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87775741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16416 + ... + 21095.

It is an arithmetic number, because the mean of its divisors is an integer number (3982524).

Almost surely, 2^87775740 is an apocalyptic number.

It is an amenable number.

87775740 is an abundant number, since it is smaller than the sum of its proper divisors (198965988).

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

87775740 is a wasteful number, since it uses less digits than its factorization.

87775740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37539 (or 37534 counting only the distinct ones).

The product of its (nonzero) digits is 384160, while the sum is 45.

The square root of 87775740 is about 9368.8707964194. The cubic root of 87775740 is about 444.4178559557.

The spelling of 87775740 in words is "eighty-seven million, seven hundred seventy-five thousand, seven hundred forty".