320785890 has 16 divisors (see below), whose sum is σ = 769886208. Its totient is φ = 85542896.

The previous prime is 320785889. The next prime is 320785897. The reversal of 320785890 is 98587023.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (320785897) 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, 5346402 + ... + 5346461.

It is an arithmetic number, because the mean of its divisors is an integer number (48117888).

Almost surely, 2^320785890 is an apocalyptic number.

320785890 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

320785890 is an abundant number, since it is smaller than the sum of its proper divisors (449100318).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

320785890 is a wasteful number, since it uses less digits than its factorization.

320785890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10692873.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 320785890 is about 17910.4966430303. The cubic root of 320785890 is about 684.5498596580.

The spelling of 320785890 in words is "three hundred twenty million, seven hundred eighty-five thousand, eight hundred ninety".