42978544 has 40 divisors (see below), whose sum is σ = 95895648. Its totient is φ = 18278400.

The previous prime is 42978541. The next prime is 42978547. The reversal of 42978544 is 44587924.

It is an interprime number because it is at equal distance from previous prime (42978541) and next prime (42978547).

It is a self number, because there is not a number n which added to its sum of digits gives 42978544.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42978541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13944 + ... + 16744.

Almost surely, 2^42978544 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 42978544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47947824).

42978544 is an abundant number, since it is smaller than the sum of its proper divisors (52917104).

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

42978544 is a wasteful number, since it uses less digits than its factorization.

42978544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2953 (or 2947 counting only the distinct ones).

The product of its digits is 322560, while the sum is 43.

The square root of 42978544 is about 6555.8023155065. The cubic root of 42978544 is about 350.2815258722.

The spelling of 42978544 in words is "forty-two million, nine hundred seventy-eight thousand, five hundred forty-four".