42868640 has 24 divisors (see below), whose sum is σ = 101277540. Its totient is φ = 17147392.

The previous prime is 42868627. The next prime is 42868783. The reversal of 42868640 is 4686824.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 40806544 + 2062096 = 6388^2 + 1436^2 .

It is a junction number, because it is equal to n+sod(n) for n = 42868594 and 42868603.

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, 133805 + ... + 134124.

Almost surely, 2^42868640 is an apocalyptic number.

42868640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42868640 is an abundant number, since it is smaller than the sum of its proper divisors (58408900).

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

42868640 is a wasteful number, since it uses less digits than its factorization.

42868640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267944 (or 267936 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 38.

The square root of 42868640 is about 6547.4147569861. The cubic root of 42868640 is about 349.9826930218.

The spelling of 42868640 in words is "forty-two million, eight hundred sixty-eight thousand, six hundred forty".