42720528 has 20 divisors (see below), whose sum is σ = 110361488. Its totient is φ = 14240160.

The previous prime is 42720527. The next prime is 42720529. The reversal of 42720528 is 82502724.

It is an interprime number because it is at equal distance from previous prime (42720527) and next prime (42720529).

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 42720495 and 42720504.

It is not an unprimeable number, because it can be changed into a prime (42720527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 444958 + ... + 445053.

Almost surely, 2^42720528 is an apocalyptic number.

42720528 is a gapful number since it is divisible by the number (48) formed by its first and last digit.

It is an amenable number.

42720528 is an abundant number, since it is smaller than the sum of its proper divisors (67640960).

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

42720528 is a wasteful number, since it uses less digits than its factorization.

42720528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890022 (or 890016 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 30.

The square root of 42720528 is about 6536.0942465665. The cubic root of 42720528 is about 349.5791622173.

The spelling of 42720528 in words is "forty-two million, seven hundred twenty thousand, five hundred twenty-eight".