71487820 has 12 divisors (see below), whose sum is σ = 150124464. Its totient is φ = 28595120.

The previous prime is 71487803. The next prime is 71487821. The reversal of 71487820 is 2878417.

It is a super-2 number, since 2×71487820² = 10221016816704800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 71487820.

It is not an unprimeable number, because it can be changed into a prime (71487821) 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, 1787176 + ... + 1787215.

It is an arithmetic number, because the mean of its divisors is an integer number (12510372).

Almost surely, 2^71487820 is an apocalyptic number.

It is an amenable number.

71487820 is an abundant number, since it is smaller than the sum of its proper divisors (78636644).

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

71487820 is a wasteful number, since it uses less digits than its factorization.

71487820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3574400 (or 3574398 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 71487820 is about 8455.0470134707. The cubic root of 71487820 is about 415.0279557304.

The spelling of 71487820 in words is "seventy-one million, four hundred eighty-seven thousand, eight hundred twenty".