87145572 has 12 divisors (see below), whose sum is σ = 203339696. Its totient is φ = 29048520.

The previous prime is 87145561. The next prime is 87145577. The reversal of 87145572 is 27554178.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 87145572.

It is not an unprimeable number, because it can be changed into a prime (87145577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3631054 + ... + 3631077.

Almost surely, 2^87145572 is an apocalyptic number.

It is an amenable number.

87145572 is an abundant number, since it is smaller than the sum of its proper divisors (116194124).

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

87145572 is a wasteful number, since it uses less digits than its factorization.

87145572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7262138 (or 7262136 counting only the distinct ones).

The product of its digits is 78400, while the sum is 39.

The square root of 87145572 is about 9335.1792698373. The cubic root of 87145572 is about 443.3517648633.

The spelling of 87145572 in words is "eighty-seven million, one hundred forty-five thousand, five hundred seventy-two".