71006420 has 24 divisors (see below), whose sum is σ = 156962400. Its totient is φ = 26907552.

The previous prime is 71006407. The next prime is 71006431. The reversal of 71006420 is 2460017.

71006420 = 1088² + 1089² + ... + 1144².

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 71006392 and 71006401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93050 + ... + 93809.

It is an arithmetic number, because the mean of its divisors is an integer number (6540100).

Almost surely, 2^71006420 is an apocalyptic number.

It is an amenable number.

71006420 is an abundant number, since it is smaller than the sum of its proper divisors (85955980).

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

71006420 is a wasteful number, since it uses less digits than its factorization.

71006420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186887 (or 186885 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 71006420 is about 8426.5307214773. The cubic root of 71006420 is about 414.0942553407.

Adding to 71006420 its reverse (2460017), we get a palindrome (73466437).

The spelling of 71006420 in words is "seventy-one million, six thousand, four hundred twenty".