87123740 has 72 divisors (see below), whose sum is σ = 210842352. Its totient is φ = 29986560.

The previous prime is 87123739. The next prime is 87123761. The reversal of 87123740 is 4732178.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 87123697 and 87123706.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78872 + ... + 79968.

It is an arithmetic number, because the mean of its divisors is an integer number (2928366).

Almost surely, 2^87123740 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87123740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105421176).

87123740 is an abundant number, since it is smaller than the sum of its proper divisors (123718612).

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

87123740 is a wasteful number, since it uses less digits than its factorization.

87123740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155 (or 1134 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 87123740 is about 9334.0098564336. The cubic root of 87123740 is about 443.3147384491.

The spelling of 87123740 in words is "eighty-seven million, one hundred twenty-three thousand, seven hundred forty".