42778370 has 8 divisors (see below), whose sum is σ = 77001084. Its totient is φ = 17111344.

The previous prime is 42778369. The next prime is 42778381. The reversal of 42778370 is 7387724.

It can be written as a sum of positive squares in 2 ways, for example, as 34304449 + 8473921 = 5857^2 + 2911^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2138909 + ... + 2138928.

Almost surely, 2^42778370 is an apocalyptic number.

42778370 is a deficient number, since it is larger than the sum of its proper divisors (34222714).

42778370 is a wasteful number, since it uses less digits than its factorization.

42778370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4277844.

The product of its (nonzero) digits is 65856, while the sum is 38.

The square root of 42778370 is about 6540.5175636183. The cubic root of 42778370 is about 349.7368634431.

The spelling of 42778370 in words is "forty-two million, seven hundred seventy-eight thousand, three hundred seventy".