70726521 has 4 divisors (see below), whose sum is σ = 94302032. Its totient is φ = 47151012.

The previous prime is 70726519. The next prime is 70726559. The reversal of 70726521 is 12562707.

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 an emirpimes, since its reverse is a distinct semiprime: 12562707 = 3 ⋅4187569.

It is not a de Polignac number, because 70726521 - 2¹ = 70726519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70726571) 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, 11787751 + ... + 11787756.

It is an arithmetic number, because the mean of its divisors is an integer number (23575508).

Almost surely, 2^70726521 is an apocalyptic number.

It is an amenable number.

70726521 is a deficient number, since it is larger than the sum of its proper divisors (23575511).

70726521 is a wasteful number, since it uses less digits than its factorization.

70726521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23575510.

The product of its (nonzero) digits is 5880, while the sum is 30.

The square root of 70726521 is about 8409.9061231384. The cubic root of 70726521 is about 413.5494351379.

The spelling of 70726521 in words is "seventy million, seven hundred twenty-six thousand, five hundred twenty-one".