7977798 has 32 divisors (see below), whose sum is σ = 17860320. Its totient is φ = 2639520.

The previous prime is 7977797. The next prime is 7977799. The reversal of 7977798 is 8977797.

It is an interprime number because it is at equal distance from previous prime (7977797) and next prime (7977799).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7977793) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8008 + ... + 8948.

It is an arithmetic number, because the mean of its divisors is an integer number (558135).

Almost surely, 2^7977798 is an apocalyptic number.

7977798 is an abundant number, since it is smaller than the sum of its proper divisors (9882522).

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

7977798 is a wasteful number, since it uses less digits than its factorization.

7977798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109 (or 1103 counting only the distinct ones).

The product of its digits is 1555848, while the sum is 54.

The square root of 7977798 is about 2824.4996016994. The cubic root of 7977798 is about 199.8148119131.

Subtracting 7977798 from its reverse (8977797), we obtain a palindrome (999999).

It can be divided in two parts, 79 and 77798, that added together give a palindrome (77877).

The spelling of 7977798 in words is "seven million, nine hundred seventy-seven thousand, seven hundred ninety-eight".