87145772 has 24 divisors (see below), whose sum is σ = 175553280. Its totient is φ = 37077840.

The previous prime is 87145771. The next prime is 87145789. The reversal of 87145772 is 27754178.

87145772 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

87145772 is strictly pandigital in base 9.

It is not an unprimeable number, because it can be changed into a prime (87145771) 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, 7304 + ... + 15087.

It is an arithmetic number, because the mean of its divisors is an integer number (7314720).

Almost surely, 2^87145772 is an apocalyptic number.

It is an amenable number.

87145772 is an abundant number, since it is smaller than the sum of its proper divisors (88407508).

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

87145772 is a wasteful number, since it uses less digits than its factorization.

87145772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22541 (or 22539 counting only the distinct ones).

The product of its digits is 109760, while the sum is 41.

The square root of 87145772 is about 9335.1899819982. The cubic root of 87145772 is about 443.3521040287.

The spelling of 87145772 in words is "eighty-seven million, one hundred forty-five thousand, seven hundred seventy-two".