87242813 has 8 divisors (see below), whose sum is σ = 104953920. Its totient is φ = 70843680.

The previous prime is 87242809. The next prime is 87242819. The reversal of 87242813 is 31824278.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87242813 - 2² = 87242809 is a prime.

It is a super-2 number, since 2×87242813² = 15222616840305938, 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 (87242819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 327848 + ... + 328113.

It is an arithmetic number, because the mean of its divisors is an integer number (13119240).

Almost surely, 2^87242813 is an apocalyptic number.

It is an amenable number.

87242813 is a deficient number, since it is larger than the sum of its proper divisors (17711107).

87242813 is a wasteful number, since it uses less digits than its factorization.

87242813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655987.

The product of its digits is 21504, while the sum is 35.

The square root of 87242813 is about 9340.3861269222. The cubic root of 87242813 is about 443.5166075990.

The spelling of 87242813 in words is "eighty-seven million, two hundred forty-two thousand, eight hundred thirteen".