71780445 has 32 divisors (see below), whose sum is σ = 139213440. Its totient is φ = 34801920.

The previous prime is 71780431. The next prime is 71780453. The reversal of 71780445 is 54408717.

It is not a de Polignac number, because 71780445 - 2⁵ = 71780413 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22684 + ... + 25653.

It is an arithmetic number, because the mean of its divisors is an integer number (4350420).

Almost surely, 2^71780445 is an apocalyptic number.

It is an amenable number.

71780445 is a deficient number, since it is larger than the sum of its proper divisors (67432995).

71780445 is a wasteful number, since it uses less digits than its factorization.

71780445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48362 (or 48356 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 36.

The square root of 71780445 is about 8472.3340939791. The cubic root of 71780445 is about 415.5934703502.

The spelling of 71780445 in words is "seventy-one million, seven hundred eighty thousand, four hundred forty-five".