87270391 has 4 divisors (see below), whose sum is σ = 93983512. Its totient is φ = 80557272.

The previous prime is 87270371. The next prime is 87270413. The reversal of 87270391 is 19307278.

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

It is a cyclic number.

It is not a de Polignac number, because 87270391 - 2¹³ = 87262199 is a prime.

It is a super-2 number, since 2×87270391² = 15232242290585762, 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 87270391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87270311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3356541 + ... + 3356566.

It is an arithmetic number, because the mean of its divisors is an integer number (23495878).

Almost surely, 2^87270391 is an apocalyptic number.

87270391 is a deficient number, since it is larger than the sum of its proper divisors (6713121).

87270391 is a wasteful number, since it uses less digits than its factorization.

87270391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6713120.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 87270391 is about 9341.8622875741. The cubic root of 87270391 is about 443.5633354688.

The spelling of 87270391 in words is "eighty-seven million, two hundred seventy thousand, three hundred ninety-one".