820189662 has 8 divisors (see below), whose sum is σ = 1640379336. Its totient is φ = 273396552.

The previous prime is 820189651. The next prime is 820189753. The reversal of 820189662 is 266981028.

It is a sphenic number, since it is the product of 3 distinct primes.

820189662 is an admirable number.

It is a super-2 number, since 2×820189662² = 1345422163303348488, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68349133 + ... + 68349144.

It is an arithmetic number, because the mean of its divisors is an integer number (205047417).

Almost surely, 2^820189662 is an apocalyptic number.

820189662 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

820189662 is a wasteful number, since it uses less digits than its factorization.

820189662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136698282.

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 820189662 is about 28638.9535772521. The cubic root of 820189662 is about 936.0623200707.

The spelling of 820189662 in words is "eight hundred twenty million, one hundred eighty-nine thousand, six hundred sixty-two".