245721880 has 64 divisors (see below), whose sum is σ = 583588800. Its totient is φ = 92928000.

The previous prime is 245721821. The next prime is 245721899. The reversal of 245721880 is 88127542.

245721880 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

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, 80380 + ... + 83380.

It is an arithmetic number, because the mean of its divisors is an integer number (9118575).

Almost surely, 2^245721880 is an apocalyptic number.

245721880 is a gapful number since it is divisible by the number (20) 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 245721880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (291794400).

245721880 is an abundant number, since it is smaller than the sum of its proper divisors (337866920).

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

245721880 is a wasteful number, since it uses less digits than its factorization.

245721880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3124 (or 3120 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 37.

The square root of 245721880 is about 15675.5184922222. The cubic root of 245721880 is about 626.3464348980.

The spelling of 245721880 in words is "two hundred forty-five million, seven hundred twenty-one thousand, eight hundred eighty".