70862821 has 4 divisors (see below), whose sum is σ = 70880832. Its totient is φ = 70844812.

The previous prime is 70862819. The next prime is 70862843. The reversal of 70862821 is 12826807.

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 70862821 - 2¹ = 70862819 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 (70862021) 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, 295 + ... + 11908.

It is an arithmetic number, because the mean of its divisors is an integer number (17720208).

Almost surely, 2^70862821 is an apocalyptic number.

It is an amenable number.

70862821 is a deficient number, since it is larger than the sum of its proper divisors (18011).

70862821 is a wasteful number, since it uses less digits than its factorization.

70862821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18010.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 70862821 is about 8418.0057614616. The cubic root of 70862821 is about 413.8149207342.

The spelling of 70862821 in words is "seventy million, eight hundred sixty-two thousand, eight hundred twenty-one".