87181040 has 40 divisors (see below), whose sum is σ = 211513248. Its totient is φ = 33355520.

The previous prime is 87181033. The next prime is 87181051. The reversal of 87181040 is 4018178.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 87180994 and 87181012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21851 + ... + 25530.

Almost surely, 2^87181040 is an apocalyptic number.

87181040 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

87181040 is an abundant number, since it is smaller than the sum of its proper divisors (124332208).

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

87181040 is a wasteful number, since it uses less digits than its factorization.

87181040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47417 (or 47411 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 87181040 is about 9337.0787722928. The cubic root of 87181040 is about 443.4119043411.

The spelling of 87181040 in words is "eighty-seven million, one hundred eighty-one thousand, forty".