820677738 has 8 divisors (see below), whose sum is σ = 1641355488. Its totient is φ = 273559244.

The previous prime is 820677731. The next prime is 820677749. The reversal of 820677738 is 837776028.

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

820677738 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (820677731) 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, 68389806 + ... + 68389817.

It is an arithmetic number, because the mean of its divisors is an integer number (205169436).

Almost surely, 2^820677738 is an apocalyptic number.

820677738 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.

820677738 is a wasteful number, since it uses less digits than its factorization.

820677738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136779628.

The product of its (nonzero) digits is 790272, while the sum is 48.

The square root of 820677738 is about 28647.4735011659. The cubic root of 820677738 is about 936.2479596367.

The spelling of 820677738 in words is "eight hundred twenty million, six hundred seventy-seven thousand, seven hundred thirty-eight".