70428 has 12 divisors (see below), whose sum is σ = 164360. Its totient is φ = 23472.

The previous prime is 70423. The next prime is 70429. The reversal of 70428 is 82407.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2923 + ... + 2946.

2⁷⁰⁴²⁸ is an apocalyptic number.

It is an amenable number.

70428 is an abundant number, since it is smaller than the sum of its proper divisors (93932).

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 (82180).

70428 is a wasteful number, since it uses less digits than its factorization.

70428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5876 (or 5874 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 70428 is about 265.3827424683. The cubic root of 70428 is about 41.2966781054.

Subtracting from 70428 its sum of digits (21), we obtain a palindrome (70407).

Adding to 70428 its product of nonzero digits (448), we get a triangular number (70876 = T₃₇₆).

The spelling of 70428 in words is "seventy thousand, four hundred twenty-eight".