71220985 has 16 divisors (see below), whose sum is σ = 93405312. Its totient is φ = 51702400.

The previous prime is 71220971. The next prime is 71220997. The reversal of 71220985 is 58902217.

It is not a de Polignac number, because 71220985 - 2⁵ = 71220953 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71220985.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46380 + ... + 47890.

It is an arithmetic number, because the mean of its divisors is an integer number (5837832).

Almost surely, 2^71220985 is an apocalyptic number.

It is an amenable number.

71220985 is a deficient number, since it is larger than the sum of its proper divisors (22184327).

71220985 is a wasteful number, since it uses less digits than its factorization.

71220985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2384.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 71220985 is about 8439.2526327869. The cubic root of 71220985 is about 414.5109349827.

The spelling of 71220985 in words is "seventy-one million, two hundred twenty thousand, nine hundred eighty-five".