42528731 has 4 divisors (see below), whose sum is σ = 48604272. Its totient is φ = 36453192.

The previous prime is 42528671. The next prime is 42528751. The reversal of 42528731 is 13782524.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42528731 - 2¹⁰ = 42527707 is a prime.

It is a super-2 number, since 2×42528731² = 3617385920940722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42528751) 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, 3037760 + ... + 3037773.

It is an arithmetic number, because the mean of its divisors is an integer number (12151068).

Almost surely, 2^42528731 is an apocalyptic number.

42528731 is a deficient number, since it is larger than the sum of its proper divisors (6075541).

42528731 is an equidigital number, since it uses as much as digits as its factorization.

42528731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6075540.

The product of its digits is 13440, while the sum is 32.

The square root of 42528731 is about 6521.4056000221. The cubic root of 42528731 is about 349.0552234297.

The spelling of 42528731 in words is "forty-two million, five hundred twenty-eight thousand, seven hundred thirty-one".