75128930 has 8 divisors (see below), whose sum is σ = 135232092. Its totient is φ = 30051568.

The previous prime is 75128927. The next prime is 75128939. The reversal of 75128930 is 3982157.

It can be written as a sum of positive squares in 2 ways, for example, as 74114881 + 1014049 = 8609^2 + 1007^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×75128930² = 11288712245889800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (75128939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3756437 + ... + 3756456.

Almost surely, 2^75128930 is an apocalyptic number.

75128930 is a deficient number, since it is larger than the sum of its proper divisors (60103162).

75128930 is a wasteful number, since it uses less digits than its factorization.

75128930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7512900.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 75128930 is about 8667.6946185246. The cubic root of 75128930 is about 421.9578471406.

The spelling of 75128930 in words is "seventy-five million, one hundred twenty-eight thousand, nine hundred thirty".