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71428 = 2272551
BaseRepresentation
bin10001011100000100
310121222111
4101130010
54241203
61310404
7415150
oct213404
9117874
1071428
1149735
1235404
1326686
141c060
151626d
hex11704

71428 has 12 divisors (see below), whose sum is σ = 142912. Its totient is φ = 30600.

The previous prime is 71419. The next prime is 71429. The reversal of 71428 is 82417.

71428 is an admirable number.

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 71399 and 71408.

It is not an unprimeable number, because it can be changed into a prime (71429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1248 + ... + 1303.

271428 is an apocalyptic number.

It is an amenable number.

71428 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71456).

71428 is a wasteful number, since it uses less digits than its factorization.

71428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2562 (or 2560 counting only the distinct ones).

The product of its digits is 448, while the sum is 22.

The square root of 71428 is about 267.2601728653. The cubic root of 71428 is about 41.4912160245.

The spelling of 71428 in words is "seventy-one thousand, four hundred twenty-eight".

Divisors: 1 2 4 7 14 28 2551 5102 10204 17857 35714 71428