445601978 has 4 divisors (see below), whose sum is σ = 668402970. Its totient is φ = 222800988.

The previous prime is 445601941. The next prime is 445601987. The reversal of 445601978 is 879106544.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 430023169 + 15578809 = 20737^2 + 3947^2 .

It is a super-2 number, since 2×445601978² = 397122245595024968, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111400493 + ... + 111400496.

Almost surely, 2^445601978 is an apocalyptic number.

445601978 is a deficient number, since it is larger than the sum of its proper divisors (222800992).

445601978 is a wasteful number, since it uses less digits than its factorization.

445601978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222800991.

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 445601978 is about 21109.2865346037. The cubic root of 445601978 is about 763.8047766042.

The spelling of 445601978 in words is "four hundred forty-five million, six hundred one thousand, nine hundred seventy-eight".