71428428 has 18 divisors (see below), whose sum is σ = 180555284. Its totient is φ = 23809464.

The previous prime is 71428417. The next prime is 71428439. The reversal of 71428428 is 82482417.

It is an interprime number because it is at equal distance from previous prime (71428417) and next prime (71428439).

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1984123 = 71428428 / (7 + 1 + 4 + 2 + 8 + 4 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 71428392 and 71428401.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 992026 + ... + 992097.

Almost surely, 2^71428428 is an apocalyptic number.

It is an amenable number.

71428428 is an abundant number, since it is smaller than the sum of its proper divisors (109126856).

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

71428428 is a wasteful number, since it uses less digits than its factorization.

71428428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1984133 (or 1984128 counting only the distinct ones).

The product of its digits is 28672, while the sum is 36.

The square root of 71428428 is about 8451.5340619322. The cubic root of 71428428 is about 414.9129889677.

The spelling of 71428428 in words is "seventy-one million, four hundred twenty-eight thousand, four hundred twenty-eight".