70021667 has 4 divisors (see below), whose sum is σ = 70525560. Its totient is φ = 69517776.

The previous prime is 70021661. The next prime is 70021687. The reversal of 70021667 is 76612007.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76612007 = 269 ⋅284803.

It is a cyclic number.

It is not a de Polignac number, because 70021667 - 2⁸ = 70021411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70021661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 251738 + ... + 252015.

It is an arithmetic number, because the mean of its divisors is an integer number (17631390).

Almost surely, 2^70021667 is an apocalyptic number.

70021667 is a deficient number, since it is larger than the sum of its proper divisors (503893).

70021667 is a wasteful number, since it uses less digits than its factorization.

70021667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503892.

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 70021667 is about 8367.8950160718. The cubic root of 70021667 is about 412.1710474461.

The spelling of 70021667 in words is "seventy million, twenty-one thousand, six hundred sixty-seven".