445561890 has 16 divisors (see below), whose sum is σ = 1069348608. Its totient is φ = 118816496.

The previous prime is 445561871. The next prime is 445561903. The reversal of 445561890 is 98165544.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7426002 + ... + 7426061.

It is an arithmetic number, because the mean of its divisors is an integer number (66834288).

Almost surely, 2^445561890 is an apocalyptic number.

445561890 is an abundant number, since it is smaller than the sum of its proper divisors (623786718).

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

445561890 is a wasteful number, since it uses less digits than its factorization.

445561890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14852073.

The product of its (nonzero) digits is 172800, while the sum is 42.

The square root of 445561890 is about 21108.3369785495. The cubic root of 445561890 is about 763.7818710176.

The spelling of 445561890 in words is "four hundred forty-five million, five hundred sixty-one thousand, eight hundred ninety".