71220655 has 16 divisors (see below), whose sum is σ = 94164768. Its totient is φ = 51280000.

The previous prime is 71220641. The next prime is 71220661. The reversal of 71220655 is 55602217.

It is not a de Polignac number, because 71220655 - 2¹⁵ = 71187887 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 856 + ... + 11965.

It is an arithmetic number, because the mean of its divisors is an integer number (5885298).

Almost surely, 2^71220655 is an apocalyptic number.

71220655 is a deficient number, since it is larger than the sum of its proper divisors (22944113).

71220655 is a wasteful number, since it uses less digits than its factorization.

71220655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12938.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 71220655 is about 8439.2330812699. The cubic root of 71220655 is about 414.5102947742.

The spelling of 71220655 in words is "seventy-one million, two hundred twenty thousand, six hundred fifty-five".