42780996 has 18 divisors (see below), whose sum is σ = 108140942. Its totient is φ = 14260320.

The previous prime is 42780973. The next prime is 42781007. The reversal of 42780996 is 69908724.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 26378496 + 16402500 = 5136^2 + 4050^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a nialpdrome in base 3 and base 9.

It is a zygodrome in base 3.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 594145 + ... + 594216.

Almost surely, 2^42780996 is an apocalyptic number.

It is an amenable number.

42780996 is an abundant number, since it is smaller than the sum of its proper divisors (65359946).

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

42780996 is a wasteful number, since it uses less digits than its factorization.

42780996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1188371 (or 1188366 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 42780996 is about 6540.7183091768. The cubic root of 42780996 is about 349.7440196314.

The spelling of 42780996 in words is "forty-two million, seven hundred eighty thousand, nine hundred ninety-six".