87240253 has 4 divisors (see below), whose sum is σ = 88344640. Its totient is φ = 86135868.

The previous prime is 87240247. The next prime is 87240269. The reversal of 87240253 is 35204278.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 35204278 = 2 ⋅17602139.

It is a cyclic number.

It is not a de Polignac number, because 87240253 - 2⁹ = 87239741 is a prime.

It is a super-2 number, since 2×87240253² = 15221723487008018, 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 (87240233) 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, 552075 + ... + 552232.

It is an arithmetic number, because the mean of its divisors is an integer number (22086160).

Almost surely, 2^87240253 is an apocalyptic number.

It is an amenable number.

87240253 is a deficient number, since it is larger than the sum of its proper divisors (1104387).

87240253 is a wasteful number, since it uses less digits than its factorization.

87240253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1104386.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 87240253 is about 9340.2490866143. The cubic root of 87240253 is about 443.5122694628.

The spelling of 87240253 in words is "eighty-seven million, two hundred forty thousand, two hundred fifty-three".