7777980 has 72 divisors (see below), whose sum is σ = 26968032. Its totient is φ = 1777536.

The previous prime is 7777967. The next prime is 7777981. The reversal of 7777980 is 897777.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7777981) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1827 + ... + 4346.

It is an arithmetic number, because the mean of its divisors is an integer number (374556).

Almost surely, 2^7777980 is an apocalyptic number.

7777980 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

7777980 is an abundant number, since it is smaller than the sum of its proper divisors (19190052).

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

7777980 is a wasteful number, since it uses less digits than its factorization.

7777980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6195 (or 6190 counting only the distinct ones).

The product of its (nonzero) digits is 172872, while the sum is 45.

The square root of 7777980 is about 2788.9030101457. The cubic root of 7777980 is about 198.1324488769.

The spelling of 7777980 in words is "seven million, seven hundred seventy-seven thousand, nine hundred eighty".