820887953 has 4 divisors (see below), whose sum is σ = 833140080. Its totient is φ = 808635828.

The previous prime is 820887943. The next prime is 820888001. The reversal of 820887953 is 359788028.

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 820887953 - 2¹⁶ = 820822417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (820887923) 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, 6125963 + ... + 6126096.

It is an arithmetic number, because the mean of its divisors is an integer number (208285020).

Almost surely, 2^820887953 is an apocalyptic number.

It is an amenable number.

820887953 is a deficient number, since it is larger than the sum of its proper divisors (12252127).

820887953 is a wasteful number, since it uses less digits than its factorization.

820887953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12252126.

The product of its (nonzero) digits is 967680, while the sum is 50.

The square root of 820887953 is about 28651.1422634421. The cubic root of 820887953 is about 936.3278921745.

The spelling of 820887953 in words is "eight hundred twenty million, eight hundred eighty-seven thousand, nine hundred fifty-three".