42780945 has 16 divisors (see below), whose sum is σ = 70810560. Its totient is φ = 22029504.

The previous prime is 42780931. The next prime is 42780967. The reversal of 42780945 is 54908724.

It is not a de Polignac number, because 42780945 - 2¹⁰ = 42779921 is a prime.

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, 48739 + ... + 49608.

It is an arithmetic number, because the mean of its divisors is an integer number (4425660).

Almost surely, 2^42780945 is an apocalyptic number.

It is an amenable number.

42780945 is a deficient number, since it is larger than the sum of its proper divisors (28029615).

42780945 is a wasteful number, since it uses less digits than its factorization.

42780945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98384.

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 42780945 is about 6540.7144105212. The cubic root of 42780945 is about 349.7438806526.

The spelling of 42780945 in words is "forty-two million, seven hundred eighty thousand, nine hundred forty-five".