71790145 has 12 divisors (see below), whose sum is σ = 100213524. Its totient is φ = 49227360.

The previous prime is 71790097. The next prime is 71790157. The reversal of 71790145 is 54109717.

It can be written as a sum of positive squares in 2 ways, for example, as 51782416 + 20007729 = 7196^2 + 4473^2 .

It is not a de Polignac number, because 71790145 - 2¹¹ = 71788097 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71790145.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 146266 + ... + 146755.

It is an arithmetic number, because the mean of its divisors is an integer number (8351127).

Almost surely, 2^71790145 is an apocalyptic number.

It is an amenable number.

71790145 is a deficient number, since it is larger than the sum of its proper divisors (28423379).

71790145 is a wasteful number, since it uses less digits than its factorization.

71790145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293040 (or 293033 counting only the distinct ones).

The product of its (nonzero) digits is 8820, while the sum is 34.

The square root of 71790145 is about 8472.9065260983. The cubic root of 71790145 is about 415.6121898175.

The spelling of 71790145 in words is "seventy-one million, seven hundred ninety thousand, one hundred forty-five".