71420820 has 24 divisors (see below), whose sum is σ = 199978464. Its totient is φ = 19045536.

The previous prime is 71420803. The next prime is 71420827. The reversal of 71420820 is 2802417.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71420827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 595114 + ... + 595233.

It is an arithmetic number, because the mean of its divisors is an integer number (8332436).

Almost surely, 2^71420820 is an apocalyptic number.

It is an amenable number.

71420820 is an abundant number, since it is smaller than the sum of its proper divisors (128557644).

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

71420820 is a wasteful number, since it uses less digits than its factorization.

71420820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1190359 (or 1190357 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 71420820 is about 8451.0839541446. The cubic root of 71420820 is about 414.8982573443.

The spelling of 71420820 in words is "seventy-one million, four hundred twenty thousand, eight hundred twenty".