70481721 has 4 divisors (see below), whose sum is σ = 93975632. Its totient is φ = 46987812.

The previous prime is 70481701. The next prime is 70481753. The reversal of 70481721 is 12718407.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 70481721 - 2⁹ = 70481209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (70481701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11746951 + ... + 11746956.

It is an arithmetic number, because the mean of its divisors is an integer number (23493908).

Almost surely, 2^70481721 is an apocalyptic number.

It is an amenable number.

70481721 is a deficient number, since it is larger than the sum of its proper divisors (23493911).

70481721 is a wasteful number, since it uses less digits than its factorization.

70481721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23493910.

The product of its (nonzero) digits is 3136, while the sum is 30.

The square root of 70481721 is about 8395.3392426989. The cubic root of 70481721 is about 413.0717551651.

The spelling of 70481721 in words is "seventy million, four hundred eighty-one thousand, seven hundred twenty-one".