70930821 has 24 divisors (see below), whose sum is σ = 105735936. Its totient is φ = 42232320.

The previous prime is 70930793. The next prime is 70930841. The reversal of 70930821 is 12803907.

It is a happy number.

It is not a de Polignac number, because 70930821 - 2⁵ = 70930789 is a prime.

It is a super-3 number, since 3×70930821³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70930841) 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 23 ways as a sum of consecutive naturals, for example, 13461 + ... + 17973.

It is an arithmetic number, because the mean of its divisors is an integer number (4405664).

Almost surely, 2^70930821 is an apocalyptic number.

It is an amenable number.

70930821 is a deficient number, since it is larger than the sum of its proper divisors (34805115).

70930821 is a wasteful number, since it uses less digits than its factorization.

70930821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4573 (or 4560 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 70930821 is about 8422.0437543390. The cubic root of 70930821 is about 413.9472440886.

The spelling of 70930821 in words is "seventy million, nine hundred thirty thousand, eight hundred twenty-one".