70576721 has 4 divisors (see below), whose sum is σ = 70593600. Its totient is φ = 70559844.

The previous prime is 70576711. The next prime is 70576729. The reversal of 70576721 is 12767507.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12767507 = 23 ⋅555109.

It is a cyclic number.

It is not a de Polignac number, because 70576721 - 2¹⁸ = 70314577 is a prime.

It is a super-2 number, since 2×70576721² = 9962147094223682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70576729) 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, 3020 + ... + 12258.

It is an arithmetic number, because the mean of its divisors is an integer number (17648400).

Almost surely, 2^70576721 is an apocalyptic number.

It is an amenable number.

70576721 is a deficient number, since it is larger than the sum of its proper divisors (16879).

70576721 is an equidigital number, since it uses as much as digits as its factorization.

70576721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16878.

The product of its (nonzero) digits is 20580, while the sum is 35.

The square root of 70576721 is about 8400.9952386607. The cubic root of 70576721 is about 413.2572604680.

The spelling of 70576721 in words is "seventy million, five hundred seventy-six thousand, seven hundred twenty-one".