42784785 has 24 divisors (see below), whose sum is σ = 75888384. Its totient is φ = 22286880.

The previous prime is 42784783. The next prime is 42784787. The reversal of 42784785 is 58748724.

It is an interprime number because it is at equal distance from previous prime (42784783) and next prime (42784787).

It is not a de Polignac number, because 42784785 - 2¹ = 42784783 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 42784785.

It is not an unprimeable number, because it can be changed into a prime (42784783) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9121 + ... + 12990.

It is an arithmetic number, because the mean of its divisors is an integer number (3162016).

Almost surely, 2^42784785 is an apocalyptic number.

42784785 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

42784785 is a deficient number, since it is larger than the sum of its proper divisors (33103599).

42784785 is a wasteful number, since it uses less digits than its factorization.

42784785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22165 (or 22162 counting only the distinct ones).

The product of its digits is 501760, while the sum is 45.

The square root of 42784785 is about 6541.0079498499. The cubic root of 42784785 is about 349.7543446284.

The spelling of 42784785 in words is "forty-two million, seven hundred eighty-four thousand, seven hundred eighty-five".