87320437 has 4 divisors (see below), whose sum is σ = 87339276. Its totient is φ = 87301600.

The previous prime is 87320377. The next prime is 87320507. The reversal of 87320437 is 73402378.

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 65707236 + 21613201 = 8106^2 + 4649^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87320437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87330437) 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, 2937 + ... + 13537.

It is an arithmetic number, because the mean of its divisors is an integer number (21834819).

Almost surely, 2^87320437 is an apocalyptic number.

It is an amenable number.

87320437 is a deficient number, since it is larger than the sum of its proper divisors (18839).

87320437 is a wasteful number, since it uses less digits than its factorization.

87320437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18838.

The product of its (nonzero) digits is 28224, while the sum is 34.

The square root of 87320437 is about 9344.5404916454. The cubic root of 87320437 is about 443.6481077437.

The spelling of 87320437 in words is "eighty-seven million, three hundred twenty thousand, four hundred thirty-seven".