42778506 has 16 divisors (see below), whose sum is σ = 85624704. Its totient is φ = 14248224.

The previous prime is 42778487. The next prime is 42778513. The reversal of 42778506 is 60587724.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9615 + ... + 13341.

It is an arithmetic number, because the mean of its divisors is an integer number (5351544).

Almost surely, 2^42778506 is an apocalyptic number.

42778506 is an abundant number, since it is smaller than the sum of its proper divisors (42846198).

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

42778506 is a wasteful number, since it uses less digits than its factorization.

42778506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5645.

The product of its (nonzero) digits is 94080, while the sum is 39.

The square root of 42778506 is about 6540.5279603408. The cubic root of 42778506 is about 349.7372340678.

The spelling of 42778506 in words is "forty-two million, seven hundred seventy-eight thousand, five hundred six".