320878587 has 16 divisors (see below), whose sum is σ = 464056992. Its totient is φ = 196423680.

The previous prime is 320878583. The next prime is 320878601. The reversal of 320878587 is 785878023.

It is not a de Polignac number, because 320878587 - 2² = 320878583 is a prime.

It is not an unprimeable number, because it can be changed into a prime (320878583) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74638 + ... + 78819.

It is an arithmetic number, because the mean of its divisors is an integer number (29003562).

Almost surely, 2^320878587 is an apocalyptic number.

320878587 is a deficient number, since it is larger than the sum of its proper divisors (143178405).

320878587 is a wasteful number, since it uses less digits than its factorization.

320878587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153518.

The product of its (nonzero) digits is 752640, while the sum is 48.

The square root of 320878587 is about 17913.0842402976. The cubic root of 320878587 is about 684.6157910774.

The spelling of 320878587 in words is "three hundred twenty million, eight hundred seventy-eight thousand, five hundred eighty-seven".