42787880 has 16 divisors (see below), whose sum is σ = 96272820. Its totient is φ = 17115136.

The previous prime is 42787853. The next prime is 42787891. The reversal of 42787880 is 8878724.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 42745444 + 42436 = 6538^2 + 206^2 .

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, 534809 + ... + 534888.

Almost surely, 2^42787880 is an apocalyptic number.

42787880 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42787880 is an abundant number, since it is smaller than the sum of its proper divisors (53484940).

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

42787880 is a wasteful number, since it uses less digits than its factorization.

42787880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1069708 (or 1069704 counting only the distinct ones).

The product of its (nonzero) digits is 200704, while the sum is 44.

The square root of 42787880 is about 6541.2445299041. The cubic root of 42787880 is about 349.7627780282.

The spelling of 42787880 in words is "forty-two million, seven hundred eighty-seven thousand, eight hundred eighty".