71965505 has 32 divisors (see below), whose sum is σ = 96484608. Its totient is φ = 51251200.

The previous prime is 71965469. The next prime is 71965511. The reversal of 71965505 is 50556917.

71965505 = T₆₆ + T₆₇ + ... + T₇₅₅.

It is not a de Polignac number, because 71965505 - 2⁶ = 71965441 is a prime.

It is a Duffinian 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, 255965 + ... + 256245.

It is an arithmetic number, because the mean of its divisors is an integer number (3015144).

Almost surely, 2^71965505 is an apocalyptic number.

It is an amenable number.

71965505 is a deficient number, since it is larger than the sum of its proper divisors (24519103).

71965505 is a wasteful number, since it uses less digits than its factorization.

71965505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457.

The product of its (nonzero) digits is 47250, while the sum is 38.

The square root of 71965505 is about 8483.2484933544. The cubic root of 71965505 is about 415.9503165054.

The spelling of 71965505 in words is "seventy-one million, nine hundred sixty-five thousand, five hundred five".