245677780 has 24 divisors (see below), whose sum is σ = 529868808. Its totient is φ = 95614848.

The previous prime is 245677741. The next prime is 245677801. The reversal of 245677780 is 87776542.

It can be written as a sum of positive squares in 4 ways, for example, as 12138256 + 233539524 = 3484^2 + 15282^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 245677780.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165259 + ... + 166738.

It is an arithmetic number, because the mean of its divisors is an integer number (22077867).

Almost surely, 2^245677780 is an apocalyptic number.

245677780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

245677780 is an abundant number, since it is smaller than the sum of its proper divisors (284191028).

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

245677780 is a wasteful number, since it uses less digits than its factorization.

245677780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332043 (or 332041 counting only the distinct ones).

The product of its (nonzero) digits is 658560, while the sum is 46.

The square root of 245677780 is about 15674.1117770673. Note that the first 3 decimals coincide. The cubic root of 245677780 is about 626.3089622746.

The spelling of 245677780 in words is "two hundred forty-five million, six hundred seventy-seven thousand, seven hundred eighty".