71255990 has 16 divisors (see below), whose sum is σ = 138127248. Its totient is φ = 26309856.

The previous prime is 71255983. The next prime is 71255999. The reversal of 71255990 is 9955217.

It is a super-2 number, since 2×71255990² = 10154832221760200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71255999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 273932 + ... + 274191.

It is an arithmetic number, because the mean of its divisors is an integer number (8632953).

Almost surely, 2^71255990 is an apocalyptic number.

71255990 is a deficient number, since it is larger than the sum of its proper divisors (66871258).

71255990 is a wasteful number, since it uses less digits than its factorization.

71255990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548143.

The product of its (nonzero) digits is 28350, while the sum is 38.

The square root of 71255990 is about 8441.3263175878. The cubic root of 71255990 is about 414.5788343465.

The spelling of 71255990 in words is "seventy-one million, two hundred fifty-five thousand, nine hundred ninety".