75450042 has 28 divisors (see below), whose sum is σ = 169688250. Its totient is φ = 25149528.

The previous prime is 75450041. The next prime is 75450047. The reversal of 75450042 is 24005457.

It can be written as a sum of positive squares in only one way, i.e., 58384881 + 17065161 = 7641^2 + 4131^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 75449988 and 75450015.

It is not an unprimeable number, because it can be changed into a prime (75450041) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 24417 + ... + 27332.

Almost surely, 2^75450042 is an apocalyptic number.

75450042 is an abundant number, since it is smaller than the sum of its proper divisors (94238208).

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

75450042 is an equidigital number, since it uses as much as digits as its factorization.

75450042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51769 (or 51754 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 27.

The square root of 75450042 is about 8686.1983629203. The cubic root of 75450042 is about 422.5581624584.

Adding to 75450042 its reverse (24005457), we get a palindrome (99455499).

The spelling of 75450042 in words is "seventy-five million, four hundred fifty thousand, forty-two".