42505828 has 12 divisors (see below), whose sum is σ = 74431980. Its totient is φ = 21239552.

The previous prime is 42505823. The next prime is 42505861. The reversal of 42505828 is 82850524.

It can be written as a sum of positive squares in 2 ways, for example, as 11614464 + 30891364 = 3408^2 + 5558^2 .

It is a junction number, because it is equal to n+sod(n) for n = 42505793 and 42505802.

It is not an unprimeable number, because it can be changed into a prime (42505823) 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, 8400 + ... + 12472.

It is an arithmetic number, because the mean of its divisors is an integer number (6202665).

Almost surely, 2^42505828 is an apocalyptic number.

It is an amenable number.

42505828 is a deficient number, since it is larger than the sum of its proper divisors (31926152).

42505828 is a wasteful number, since it uses less digits than its factorization.

42505828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6686 (or 6684 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 34.

The square root of 42505828 is about 6519.6493770754. The cubic root of 42505828 is about 348.9925532684.

The spelling of 42505828 in words is "forty-two million, five hundred five thousand, eight hundred twenty-eight".