75409425 has 144 divisors (see below), whose sum is σ = 173322240. Its totient is φ = 30481920.

The previous prime is 75409409. The next prime is 75409447. The reversal of 75409425 is 52490457.

75409425 is a `hidden beast` number, since 7 + 540 + 94 + 25 = 666.

It is not a de Polignac number, because 75409425 - 2⁴ = 75409409 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 75409425.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 593712 + ... + 593838.

Almost surely, 2^75409425 is an apocalyptic number.

75409425 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

75409425 is an abundant number, since it is smaller than the sum of its proper divisors (97912815).

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

75409425 is a wasteful number, since it uses less digits than its factorization.

75409425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192 (or 184 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 75409425 is about 8683.8600288121. The cubic root of 75409425 is about 422.4823236422.

The spelling of 75409425 in words is "seventy-five million, four hundred nine thousand, four hundred twenty-five".