70481281 has 24 divisors (see below), whose sum is σ = 80439480. Its totient is φ = 61641216.

The previous prime is 70481273. The next prime is 70481287. The reversal of 70481281 is 18218407.

It can be written as a sum of positive squares in 12 ways, for example, as 11498881 + 58982400 = 3391^2 + 7680^2 .

It is not a de Polignac number, because 70481281 - 2³ = 70481273 is a prime.

It is a super-2 number, since 2×70481281² = 9935221942801922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70481287) 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, 357675 + ... + 357871.

It is an arithmetic number, because the mean of its divisors is an integer number (3351645).

Almost surely, 2^70481281 is an apocalyptic number.

It is an amenable number.

70481281 is a deficient number, since it is larger than the sum of its proper divisors (9958199).

70481281 is a wasteful number, since it uses less digits than its factorization.

70481281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325 (or 312 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 70481281 is about 8395.3130376419. The cubic root of 70481281 is about 413.0708955949.

Adding to 70481281 its reverse (18218407), we get a palindrome (88699688).

The spelling of 70481281 in words is "seventy million, four hundred eighty-one thousand, two hundred eighty-one".