977808 has 40 divisors (see below), whose sum is σ = 2722048. Its totient is φ = 300672.

The previous prime is 977803. The next prime is 977813. The reversal of 977808 is 808779.

It is an interprime number because it is at equal distance from previous prime (977803) and next prime (977813).

It is a super-2 number, since 2×977808² = 1912216969728, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (977803) by changing a digit.

977808 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160 + ... + 1407.

2⁹⁷⁷⁸⁰⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 977808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1361024).

977808 is an abundant number, since it is smaller than the sum of its proper divisors (1744240).

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

977808 is a wasteful number, since it uses less digits than its factorization.

977808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1591 (or 1585 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 39.

The square root of 977808 is about 988.8417466916. The cubic root of 977808 is about 99.2547261336.

The spelling of 977808 in words is "nine hundred seventy-seven thousand, eight hundred eight".