87240133 has 4 divisors (see below), whose sum is σ = 87348780. Its totient is φ = 87131488.

The previous prime is 87240113. The next prime is 87240137. The reversal of 87240133 is 33104278.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 45792289 + 41447844 = 6767^2 + 6438^2 .

It is a cyclic number.

It is not a de Polignac number, because 87240133 - 2²⁵ = 53685701 is a prime.

It is a super-2 number, since 2×87240133² = 15221681611715378, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87240137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53110 + ... + 54727.

It is an arithmetic number, because the mean of its divisors is an integer number (21837195).

Almost surely, 2^87240133 is an apocalyptic number.

It is an amenable number.

87240133 is a deficient number, since it is larger than the sum of its proper divisors (108647).

87240133 is a wasteful number, since it uses less digits than its factorization.

87240133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108646.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 87240133 is about 9340.2426628006. The cubic root of 87240133 is about 443.5120661105.

The spelling of 87240133 in words is "eighty-seven million, two hundred forty thousand, one hundred thirty-three".