77775552 has 98 divisors (see below), whose sum is σ = 231536748. Its totient is φ = 25909632.

The previous prime is 77775541. The next prime is 77775557. The reversal of 77775552 is 25557777.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 77775498 and 77775507.

It is not an unprimeable number, because it can be changed into a prime (77775557) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 45823 + ... + 47489.

Almost surely, 2^77775552 is an apocalyptic number.

77775552 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77775552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115768374).

77775552 is an abundant number, since it is smaller than the sum of its proper divisors (153761196).

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

77775552 is an equidigital number, since it uses as much as digits as its factorization.

77775552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1697 (or 1672 counting only the distinct ones).

The product of its digits is 600250, while the sum is 45.

The square root of 77775552 is about 8819.0448462404. The cubic root of 77775552 is about 426.8556497884.

The spelling of 77775552 in words is "seventy-seven million, seven hundred seventy-five thousand, five hundred fifty-two".