997777770 has 128 divisors (see below), whose sum is σ = 2861879040. Its totient is φ = 219770880.

The previous prime is 997777757. The next prime is 997777771. The reversal of 997777770 is 77777799.

It is a super-3 number, since 3×997777770³ (a number of 28 digits) contains 333 as substring.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (997777771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 159624 + ... + 165756.

It is an arithmetic number, because the mean of its divisors is an integer number (22358430).

Almost surely, 2^997777770 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 997777770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1430939520).

997777770 is an abundant number, since it is smaller than the sum of its proper divisors (1864101270).

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

997777770 is a wasteful number, since it uses less digits than its factorization.

997777770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6200.

The product of its (nonzero) digits is 9529569, while the sum is 60.

The square root of 997777770 is about 31587.6205181714. The cubic root of 997777770 is about 999.2587072876.

It can be divided in two parts, 9 and 97777770, that added together give a palindrome (97777779).

The spelling of 997777770 in words is "nine hundred ninety-seven million, seven hundred seventy-seven thousand, seven hundred seventy".