87145140 has 24 divisors (see below), whose sum is σ = 244006560. Its totient is φ = 23238688.

The previous prime is 87145127. The next prime is 87145141. The reversal of 87145140 is 4154178.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 87145098 and 87145107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87145141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 726150 + ... + 726269.

It is an arithmetic number, because the mean of its divisors is an integer number (10166940).

Almost surely, 2^87145140 is an apocalyptic number.

It is an amenable number.

87145140 is an abundant number, since it is smaller than the sum of its proper divisors (156861420).

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

87145140 is a wasteful number, since it uses less digits than its factorization.

87145140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1452431 (or 1452429 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 30.

The square root of 87145140 is about 9335.1561315277. The cubic root of 87145140 is about 443.3510322643.

The spelling of 87145140 in words is "eighty-seven million, one hundred forty-five thousand, one hundred forty".