820074751 has 4 divisors (see below), whose sum is σ = 863236600. Its totient is φ = 776912904.

The previous prime is 820074641. The next prime is 820074769. The reversal of 820074751 is 157470028.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 820074751 - 2¹¹ = 820072703 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 (820074791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21580896 + ... + 21580933.

It is an arithmetic number, because the mean of its divisors is an integer number (215809150).

Almost surely, 2^820074751 is an apocalyptic number.

820074751 is a deficient number, since it is larger than the sum of its proper divisors (43161849).

820074751 is a wasteful number, since it uses less digits than its factorization.

820074751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43161848.

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 820074751 is about 28636.9473058844. The cubic root of 820074751 is about 936.0186029949.

The spelling of 820074751 in words is "eight hundred twenty million, seventy-four thousand, seven hundred fifty-one".