87781152 has 48 divisors (see below), whose sum is σ = 230912640. Its totient is φ = 29198592.

The previous prime is 87781139. The next prime is 87781153. The reversal of 87781152 is 25118778.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 87781152.

It is not an unprimeable number, because it can be changed into a prime (87781153) 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, 79033 + ... + 80135.

It is an arithmetic number, because the mean of its divisors is an integer number (4810680).

Almost surely, 2^87781152 is an apocalyptic number.

It is an amenable number.

87781152 is an abundant number, since it is smaller than the sum of its proper divisors (143131488).

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

87781152 is a wasteful number, since it uses less digits than its factorization.

87781152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1945 (or 1937 counting only the distinct ones).

The product of its digits is 31360, while the sum is 39.

The square root of 87781152 is about 9369.1596207984. The cubic root of 87781152 is about 444.4269896108.

The spelling of 87781152 in words is "eighty-seven million, seven hundred eighty-one thousand, one hundred fifty-two".