646379090 has 48 divisors (see below), whose sum is σ = 1355809752. Its totient is φ = 221227776.

The previous prime is 646379089. The next prime is 646379099. The reversal of 646379090 is 90973646.

646379090 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 641760889 + 4618201 = 25333^2 + 2149^2 .

It is not an unprimeable number, because it can be changed into a prime (646379099) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 505532 + ... + 506808.

Almost surely, 2^646379090 is an apocalyptic number.

646379090 is an abundant number, since it is smaller than the sum of its proper divisors (709430662).

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

646379090 is a wasteful number, since it uses less digits than its factorization.

646379090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2331 (or 2324 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 44.

The square root of 646379090 is about 25423.9865088070. The cubic root of 646379090 is about 864.6276098729.

The spelling of 646379090 in words is "six hundred forty-six million, three hundred seventy-nine thousand, ninety".