70726021 has 4 divisors (see below), whose sum is σ = 70926732. Its totient is φ = 70525312.

The previous prime is 70725997. The next prime is 70726039. The reversal of 70726021 is 12062707.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8473921 + 62252100 = 2911^2 + 7890^2 .

It is a cyclic number.

It is not a de Polignac number, because 70726021 - 2⁹ = 70725509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70726091) 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, 99826 + ... + 100531.

It is an arithmetic number, because the mean of its divisors is an integer number (17731683).

Almost surely, 2^70726021 is an apocalyptic number.

It is an amenable number.

70726021 is a deficient number, since it is larger than the sum of its proper divisors (200711).

70726021 is a wasteful number, since it uses less digits than its factorization.

70726021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200710.

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 70726021 is about 8409.8763962379. The cubic root of 70726021 is about 413.5484606085.

Adding to 70726021 its reverse (12062707), we get a palindrome (82788728).

It can be divided in two parts, 707260 and 21, that added together give a 4-th power (707281 = 29⁴).

The spelling of 70726021 in words is "seventy million, seven hundred twenty-six thousand, twenty-one".