87881013 has 24 divisors (see below), whose sum is σ = 138790080. Its totient is φ = 53141760.

The previous prime is 87880997. The next prime is 87881029. The reversal of 87881013 is 31018878.

It is an interprime number because it is at equal distance from previous prime (87880997) and next prime (87881029).

It is not a de Polignac number, because 87881013 - 2⁴ = 87880997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87881033) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65968 + ... + 67286.

It is an arithmetic number, because the mean of its divisors is an integer number (5782920).

Almost surely, 2^87881013 is an apocalyptic number.

It is an amenable number.

87881013 is a deficient number, since it is larger than the sum of its proper divisors (50909067).

87881013 is a wasteful number, since it uses less digits than its factorization.

87881013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2009 (or 2006 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

The square root of 87881013 is about 9374.4873459832. The cubic root of 87881013 is about 444.5954544190.

It can be divided in two parts, 8788 and 1013, that added together give a square (9801 = 99²).

The spelling of 87881013 in words is "eighty-seven million, eight hundred eighty-one thousand, thirteen".