70820321 has 16 divisors (see below), whose sum is σ = 83462400. Its totient is φ = 59243520.

The previous prime is 70820297. The next prime is 70820339. The reversal of 70820321 is 12302807.

It is a cyclic number.

It is not a de Polignac number, because 70820321 - 2²² = 66626017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70820341) 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 15 ways as a sum of consecutive naturals, for example, 63656 + ... + 64758.

It is an arithmetic number, because the mean of its divisors is an integer number (5216400).

Almost surely, 2^70820321 is an apocalyptic number.

It is an amenable number.

70820321 is a deficient number, since it is larger than the sum of its proper divisors (12642079).

70820321 is a wasteful number, since it uses less digits than its factorization.

70820321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1576.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 70820321 is about 8415.4810320029. The cubic root of 70820321 is about 413.7321756453.

The spelling of 70820321 in words is "seventy million, eight hundred twenty thousand, three hundred twenty-one".