75781428 has 24 divisors (see below), whose sum is σ = 176971200. Its totient is φ = 25239360.

The previous prime is 75781423. The next prime is 75781451. The reversal of 75781428 is 82418757.

It is a self number, because there is not a number n which added to its sum of digits gives 75781428.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75781423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20248 + ... + 23696.

It is an arithmetic number, because the mean of its divisors is an integer number (7373800).

Almost surely, 2^75781428 is an apocalyptic number.

It is an amenable number.

75781428 is an abundant number, since it is smaller than the sum of its proper divisors (101189772).

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

75781428 is a wasteful number, since it uses less digits than its factorization.

75781428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5287 (or 5285 counting only the distinct ones).

The product of its digits is 125440, while the sum is 42.

The square root of 75781428 is about 8705.2528969582. The cubic root of 75781428 is about 423.1759016704.

The spelling of 75781428 in words is "seventy-five million, seven hundred eighty-one thousand, four hundred twenty-eight".