42780770 has 8 divisors (see below), whose sum is σ = 77005404. Its totient is φ = 17112304.

The previous prime is 42780707. The next prime is 42780779. The reversal of 42780770 is 7708724.

It can be written as a sum of positive squares in 2 ways, for example, as 34492129 + 8288641 = 5873^2 + 2879^2 .

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

It is a super-4 number, since 4×42780770⁴ (a number of 32 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 42780770.

It is not an unprimeable number, because it can be changed into a prime (42780779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2139029 + ... + 2139048.

Almost surely, 2^42780770 is an apocalyptic number.

42780770 is a deficient number, since it is larger than the sum of its proper divisors (34224634).

42780770 is a wasteful number, since it uses less digits than its factorization.

42780770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4278084.

The product of its (nonzero) digits is 21952, while the sum is 35.

The square root of 42780770 is about 6540.7010327640. The cubic root of 42780770 is about 349.7434037638.

The spelling of 42780770 in words is "forty-two million, seven hundred eighty thousand, seven hundred seventy".