70940821 has 4 divisors (see below), whose sum is σ = 81075232. Its totient is φ = 60806412.

The previous prime is 70940801. The next prime is 70940827. The reversal of 70940821 is 12804907.

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 a cyclic number.

It is not a de Polignac number, because 70940821 - 2⁷ = 70940693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70940827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5067195 + ... + 5067208.

It is an arithmetic number, because the mean of its divisors is an integer number (20268808).

Almost surely, 2^70940821 is an apocalyptic number.

It is an amenable number.

70940821 is a deficient number, since it is larger than the sum of its proper divisors (10134411).

70940821 is a wasteful number, since it uses less digits than its factorization.

70940821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10134410.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 70940821 is about 8422.6374135422. The cubic root of 70940821 is about 413.9666962716.

The spelling of 70940821 in words is "seventy million, nine hundred forty thousand, eight hundred twenty-one".