42780744 has 64 divisors (see below), whose sum is σ = 122688000. Its totient is φ = 13798080.

The previous prime is 42780707. The next prime is 42780779. The reversal of 42780744 is 44708724.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 42780699 and 42780708.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3502 + ... + 9890.

It is an arithmetic number, because the mean of its divisors is an integer number (1917000).

Almost surely, 2^42780744 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42780744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61344000).

42780744 is an abundant number, since it is smaller than the sum of its proper divisors (79907256).

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

42780744 is a wasteful number, since it uses less digits than its factorization.

42780744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6435 (or 6425 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 36.

The square root of 42780744 is about 6540.6990452092. The cubic root of 42780744 is about 349.7433329116.

The spelling of 42780744 in words is "forty-two million, seven hundred eighty thousand, seven hundred forty-four".