42499728 has 120 divisors (see below), whose sum is σ = 130804128. Its totient is φ = 13312512.

The previous prime is 42499727. The next prime is 42499733. The reversal of 42499728 is 82799424.

It is not an unprimeable number, because it can be changed into a prime (42499727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65775 + ... + 66417.

Almost surely, 2^42499728 is an apocalyptic number.

42499728 is a gapful number since it is divisible by the number (48) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42499728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65402064).

42499728 is an abundant number, since it is smaller than the sum of its proper divisors (88304400).

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

42499728 is a wasteful number, since it uses less digits than its factorization.

42499728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 683 (or 665 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 42499728 is about 6519.1815437216. The cubic root of 42499728 is about 348.9758578604.

The spelling of 42499728 in words is "forty-two million, four hundred ninety-nine thousand, seven hundred twenty-eight".