7780998780 has 144 divisors (see below), whose sum is σ = 24786790560. Its totient is φ = 2026418688.

The previous prime is 7780998779. The next prime is 7780998781. The reversal of 7780998780 is 878990877.

It is an interprime number because it is at equal distance from previous prime (7780998779) and next prime (7780998781).

It is a super-2 number, since 2×7780998780² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7780998781) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 994564 + ... + 1002356.

It is an arithmetic number, because the mean of its divisors is an integer number (172130490).

Almost surely, 2^7780998780 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 7780998780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12393395280).

7780998780 is an abundant number, since it is smaller than the sum of its proper divisors (17005791780).

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

7780998780 is a wasteful number, since it uses less digits than its factorization.

7780998780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7897 (or 7846 counting only the distinct ones).

The product of its (nonzero) digits is 14224896, while the sum is 63.

The square root of 7780998780 is about 88209.9698446837. The cubic root of 7780998780 is about 1981.5807853526.

The spelling of 7780998780 in words is "seven billion, seven hundred eighty million, nine hundred ninety-eight thousand, seven hundred eighty".