42779990 has 32 divisors (see below), whose sum is σ = 88949664. Its totient is φ = 14640640.

The previous prime is 42779941. The next prime is 42780013. The reversal of 42779990 is 9997724.

It is a congruent number.

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, 9569 + ... + 13308.

It is an arithmetic number, because the mean of its divisors is an integer number (2779677).

Almost surely, 2^42779990 is an apocalyptic number.

42779990 is an abundant number, since it is smaller than the sum of its proper divisors (46169674).

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

42779990 is a wasteful number, since it uses less digits than its factorization.

42779990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22912.

The product of its (nonzero) digits is 285768, while the sum is 47.

The square root of 42779990 is about 6540.6414058562. The cubic root of 42779990 is about 349.7412781864.

The spelling of 42779990 in words is "forty-two million, seven hundred seventy-nine thousand, nine hundred ninety".