71840428 has 24 divisors (see below), whose sum is σ = 138373200. Its totient is φ = 32363520.

The previous prime is 71840411. The next prime is 71840429. The reversal of 71840428 is 82404817.

It is a super-2 number, since 2×71840428² = 10322094190446368, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71840393 and 71840402.

It is not an unprimeable number, because it can be changed into a prime (71840429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2253 + ... + 12196.

It is an arithmetic number, because the mean of its divisors is an integer number (5765550).

Almost surely, 2^71840428 is an apocalyptic number.

It is an amenable number.

71840428 is a deficient number, since it is larger than the sum of its proper divisors (66532772).

71840428 is a wasteful number, since it uses less digits than its factorization.

71840428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14577 (or 14575 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 34.

The square root of 71840428 is about 8475.8732883403. The cubic root of 71840428 is about 415.7092010461.

The spelling of 71840428 in words is "seventy-one million, eight hundred forty thousand, four hundred twenty-eight".