87381144 has 24 divisors (see below), whose sum is σ = 236657460. Its totient is φ = 29127024.

The previous prime is 87381143. The next prime is 87381169. The reversal of 87381144 is 44118378.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 87381099 and 87381108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87381143) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 606742 + ... + 606885.

Almost surely, 2^87381144 is an apocalyptic number.

It is an amenable number.

87381144 is an abundant number, since it is smaller than the sum of its proper divisors (149276316).

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

87381144 is a wasteful number, since it uses less digits than its factorization.

87381144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1213639 (or 1213632 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 87381144 is about 9347.7881875875. The cubic root of 87381144 is about 443.7508950851.

The spelling of 87381144 in words is "eighty-seven million, three hundred eighty-one thousand, one hundred forty-four".