87245791 has 4 divisors (see below), whose sum is σ = 88891992. Its totient is φ = 85599592.

The previous prime is 87245747. The next prime is 87245797. The reversal of 87245791 is 19754278.

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 87245791 - 2¹³ = 87237599 is a prime.

It is a super-2 number, since 2×87245791² = 15223656094431362, 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 (87245797) 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, 823021 + ... + 823126.

It is an arithmetic number, because the mean of its divisors is an integer number (22222998).

Almost surely, 2^87245791 is an apocalyptic number.

87245791 is a deficient number, since it is larger than the sum of its proper divisors (1646201).

87245791 is a wasteful number, since it uses less digits than its factorization.

87245791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1646200.

The product of its digits is 141120, while the sum is 43.

The square root of 87245791 is about 9340.5455408129. The cubic root of 87245791 is about 443.5216539647.

The spelling of 87245791 in words is "eighty-seven million, two hundred forty-five thousand, seven hundred ninety-one".