977788 has 24 divisors (see below), whose sum is σ = 1999872. Its totient is φ = 409584.

The previous prime is 977761. The next prime is 977791. The reversal of 977788 is 887779.

It is a happy number.

It is a plaindrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 945 + ... + 1687.

It is an arithmetic number, because the mean of its divisors is an integer number (83328).

2⁹⁷⁷⁷⁸⁸ 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 977788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (999936).

977788 is an abundant number, since it is smaller than the sum of its proper divisors (1022084).

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

977788 is a wasteful number, since it uses less digits than its factorization.

977788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 801 (or 799 counting only the distinct ones).

The product of its digits is 197568, while the sum is 46.

The square root of 977788 is about 988.8316337982. The cubic root of 977788 is about 99.2540494132.

Subtracting from 977788 its reverse (887779), we obtain a palindrome (90009).

The spelling of 977788 in words is "nine hundred seventy-seven thousand, seven hundred eighty-eight".