646200390 has 32 divisors (see below), whose sum is σ = 1691870976. Its totient is φ = 156654560.

The previous prime is 646200383. The next prime is 646200463. The reversal of 646200390 is 93002646.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 978762 + ... + 979421.

It is an arithmetic number, because the mean of its divisors is an integer number (52870968).

Almost surely, 2^646200390 is an apocalyptic number.

646200390 is an abundant number, since it is smaller than the sum of its proper divisors (1045670586).

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

646200390 is a wasteful number, since it uses less digits than its factorization.

646200390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1958204.

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 646200390 is about 25420.4718681617. The cubic root of 646200390 is about 864.5479233045.

The spelling of 646200390 in words is "six hundred forty-six million, two hundred thousand, three hundred ninety".