42749775 has 72 divisors (see below), whose sum is σ = 82328064. Its totient is φ = 21967200.

The previous prime is 42749771. The next prime is 42749789. The reversal of 42749775 is 57794724.

It is not a de Polignac number, because 42749775 - 2² = 42749771 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 42749775.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42749771) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 188212 + ... + 188438.

Almost surely, 2^42749775 is an apocalyptic number.

42749775 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

42749775 is a deficient number, since it is larger than the sum of its proper divisors (39578289).

42749775 is a wasteful number, since it uses less digits than its factorization.

42749775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283 (or 266 counting only the distinct ones).

The product of its digits is 493920, while the sum is 45.

The square root of 42749775 is about 6538.3312091083. The cubic root of 42749775 is about 349.6589194202.

The spelling of 42749775 in words is "forty-two million, seven hundred forty-nine thousand, seven hundred seventy-five".