71273780 has 24 divisors (see below), whose sum is σ = 156183552. Its totient is φ = 27269792.

The previous prime is 71273777. The next prime is 71273857. The reversal of 71273780 is 8737217.

It is a self number, because there is not a number n which added to its sum of digits gives 71273780.

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, 77012 + ... + 77931.

It is an arithmetic number, because the mean of its divisors is an integer number (6507648).

Almost surely, 2^71273780 is an apocalyptic number.

It is an amenable number.

71273780 is an abundant number, since it is smaller than the sum of its proper divisors (84909772).

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

71273780 is a wasteful number, since it uses less digits than its factorization.

71273780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154975 (or 154973 counting only the distinct ones).

The product of its (nonzero) digits is 16464, while the sum is 35.

The square root of 71273780 is about 8442.3799961859. The cubic root of 71273780 is about 414.6133331714.

The spelling of 71273780 in words is "seventy-one million, two hundred seventy-three thousand, seven hundred eighty".