70644921 has 4 divisors (see below), whose sum is σ = 94193232. Its totient is φ = 47096612.

The previous prime is 70644887. The next prime is 70644941. The reversal of 70644921 is 12944607.

It is a happy number.

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 70644921 - 2⁶ = 70644857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (70644941) 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, 11774151 + ... + 11774156.

It is an arithmetic number, because the mean of its divisors is an integer number (23548308).

Almost surely, 2^70644921 is an apocalyptic number.

It is an amenable number.

70644921 is a deficient number, since it is larger than the sum of its proper divisors (23548311).

70644921 is a wasteful number, since it uses less digits than its factorization.

70644921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23548310.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 70644921 is about 8405.0533014372. The cubic root of 70644921 is about 413.3903311240.

The spelling of 70644921 in words is "seventy million, six hundred forty-four thousand, nine hundred twenty-one".