70743821 has 4 divisors (see below), whose sum is σ = 74467200. Its totient is φ = 67020444.

The previous prime is 70743797. The next prime is 70743823. The reversal of 70743821 is 12834707.

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 a de Polignac number, because none of the positive numbers 2^k-70743821 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 (70743823) 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, 1861661 + ... + 1861698.

It is an arithmetic number, because the mean of its divisors is an integer number (18616800).

Almost surely, 2^70743821 is an apocalyptic number.

It is an amenable number.

70743821 is a deficient number, since it is larger than the sum of its proper divisors (3723379).

70743821 is a wasteful number, since it uses less digits than its factorization.

70743821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3723378.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 70743821 is about 8410.9346091858. The cubic root of 70743821 is about 413.5831510239.

The spelling of 70743821 in words is "seventy million, seven hundred forty-three thousand, eight hundred twenty-one".