71842428 has 108 divisors (see below), whose sum is σ = 213496920. Its totient is φ = 20309184.

The previous prime is 71842423. The next prime is 71842451. The reversal of 71842428 is 82424817.

It is a super-2 number, since 2×71842428² = 10322668921870368, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 71842392 and 71842401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71842423) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 245050 + ... + 245342.

Almost surely, 2^71842428 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71842428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106748460).

71842428 is an abundant number, since it is smaller than the sum of its proper divisors (141654492).

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

71842428 is a wasteful number, since it uses less digits than its factorization.

71842428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456 (or 444 counting only the distinct ones).

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

The square root of 71842428 is about 8475.9912694622. The cubic root of 71842428 is about 415.7130587193.

The spelling of 71842428 in words is "seventy-one million, eight hundred forty-two thousand, four hundred twenty-eight".