70711280 has 60 divisors (see below), whose sum is σ = 170430312. Its totient is φ = 27283200.

The previous prime is 70711273. The next prime is 70711283. The reversal of 70711280 is 8211707.

It is a Cunningham number, because it is equal to 8409²-1.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70711283) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66755 + ... + 67805.

Almost surely, 2^70711280 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 70711280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85215156).

70711280 is an abundant number, since it is smaller than the sum of its proper divisors (99719032).

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

70711280 is a wasteful number, since it uses less digits than its factorization.

70711280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122 (or 1087 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 26.

The square root of 70711280 is about 8408.9999405399. Note that the first 4 decimals coincide. The cubic root of 70711280 is about 413.5197274712.

Adding to 70711280 its reverse (8211707), we get a palindrome (78922987).

The spelling of 70711280 in words is "seventy million, seven hundred eleven thousand, two hundred eighty".