75139428 has 144 divisors (see below), whose sum is σ = 222996480. Its totient is φ = 19274112.

The previous prime is 75139399. The next prime is 75139451. The reversal of 75139428 is 82493157.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 951093 + ... + 951171.

Almost surely, 2^75139428 is an apocalyptic number.

75139428 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 75139428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111498240).

75139428 is an abundant number, since it is smaller than the sum of its proper divisors (147857052).

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

75139428 is a wasteful number, since it uses less digits than its factorization.

75139428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186 (or 171 counting only the distinct ones).

The product of its digits is 60480, while the sum is 39.

The square root of 75139428 is about 8668.3001793893. The cubic root of 75139428 is about 421.9775000545.

The spelling of 75139428 in words is "seventy-five million, one hundred thirty-nine thousand, four hundred twenty-eight".