42078690 has 40 divisors (see below), whose sum is σ = 113147100. Its totient is φ = 11220768.

The previous prime is 42078679. The next prime is 42078691. The reversal of 42078690 is 9687024.

It can be written as a sum of positive squares in 2 ways, for example, as 40030929 + 2047761 = 6327^2 + 1431^2 .

It is a super-2 number, since 2×42078690² = 3541232304232200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42078691) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 25165 + ... + 26784.

Almost surely, 2^42078690 is an apocalyptic number.

42078690 is an abundant number, since it is smaller than the sum of its proper divisors (71068410).

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

42078690 is a wasteful number, since it uses less digits than its factorization.

42078690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51968 (or 51959 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 42078690 is about 6486.8089227293. The cubic root of 42078690 is about 347.8196151943.

The spelling of 42078690 in words is "forty-two million, seventy-eight thousand, six hundred ninety".