71990280 has 96 divisors (see below), whose sum is σ = 235085760. Its totient is φ = 19105920.

The previous prime is 71990273. The next prime is 71990287. The reversal of 71990280 is 8209917.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (71990273) and next prime (71990287).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (71990287) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 111639 + ... + 112281.

It is an arithmetic number, because the mean of its divisors is an integer number (2448810).

Almost surely, 2^71990280 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71990280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117542880).

71990280 is an abundant number, since it is smaller than the sum of its proper divisors (163095480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71990280 is a wasteful number, since it uses less digits than its factorization.

71990280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 971 (or 964 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 71990280 is about 8484.7085984140. The cubic root of 71990280 is about 415.9980430135.

The spelling of 71990280 in words is "seventy-one million, nine hundred ninety thousand, two hundred eighty".