7770081620 has 48 divisors (see below), whose sum is σ = 18654666240. Its totient is φ = 2663103744.

The previous prime is 7770081611. The next prime is 7770081637. The reversal of 7770081620 is 261800777.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 486197 + ... + 501923.

It is an arithmetic number, because the mean of its divisors is an integer number (388638880).

Almost surely, 2^7770081620 is an apocalyptic number.

7770081620 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

7770081620 is an abundant number, since it is smaller than the sum of its proper divisors (10884584620).

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

7770081620 is a wasteful number, since it uses less digits than its factorization.

7770081620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19272 (or 19270 counting only the distinct ones).

The product of its (nonzero) digits is 32928, while the sum is 38.

The square root of 7770081620 is about 88148.0664563892. The cubic root of 7770081620 is about 1980.6535967605.

The spelling of 7770081620 in words is "seven billion, seven hundred seventy million, eighty-one thousand, six hundred twenty".