70835821 has 12 divisors (see below), whose sum is σ = 87248988. Its totient is φ = 57144192.

The previous prime is 70835803. The next prime is 70835827. The reversal of 70835821 is 12853807.

It can be written as a sum of positive squares in 2 ways, for example, as 39866596 + 30969225 = 6314^2 + 5565^2 .

It is not a de Polignac number, because 70835821 - 2⁵ = 70835789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70835827) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41686 + ... + 43351.

It is an arithmetic number, because the mean of its divisors is an integer number (7270749).

Almost surely, 2^70835821 is an apocalyptic number.

It is an amenable number.

70835821 is a deficient number, since it is larger than the sum of its proper divisors (16413167).

70835821 is a wasteful number, since it uses less digits than its factorization.

70835821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85068 (or 85061 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 70835821 is about 8416.4019034264. The cubic root of 70835821 is about 413.7623571000.

The spelling of 70835821 in words is "seventy million, eight hundred thirty-five thousand, eight hundred twenty-one".