87252661 has 4 divisors (see below), whose sum is σ = 87385324. Its totient is φ = 87120000.

The previous prime is 87252637. The next prime is 87252689. The reversal of 87252661 is 16625278.

It is a happy number.

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 75794436 + 11458225 = 8706^2 + 3385^2 .

It is a 4-Lehmer number, since φ(87252661) divides (87252661-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 87252661 - 2¹⁵ = 87219893 is a prime.

It is a super-2 number, since 2×87252661² = 15226053703161842, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87252661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87252601) 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, 65340 + ... + 66661.

It is an arithmetic number, because the mean of its divisors is an integer number (21846331).

Almost surely, 2^87252661 is an apocalyptic number.

It is an amenable number.

87252661 is a deficient number, since it is larger than the sum of its proper divisors (132663).

87252661 is a wasteful number, since it uses less digits than its factorization.

87252661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132662.

The product of its digits is 40320, while the sum is 37.

The square root of 87252661 is about 9340.9132851130. The cubic root of 87252661 is about 443.5332950756.

The spelling of 87252661 in words is "eighty-seven million, two hundred fifty-two thousand, six hundred sixty-one".