245491780 has 48 divisors (see below), whose sum is σ = 545287680. Its totient is φ = 92579328.

The previous prime is 245491769. The next prime is 245491787. The reversal of 245491780 is 87194542.

It is not an unprimeable number, because it can be changed into a prime (245491787) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83292 + ... + 86188.

It is an arithmetic number, because the mean of its divisors is an integer number (11360160).

Almost surely, 2^245491780 is an apocalyptic number.

245491780 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 245491780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (272643840).

245491780 is an abundant number, since it is smaller than the sum of its proper divisors (299795900).

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

245491780 is a wasteful number, since it uses less digits than its factorization.

245491780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3148 (or 3146 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 245491780 is about 15668.1773030560. The cubic root of 245491780 is about 626.1508651144.

The spelling of 245491780 in words is "two hundred forty-five million, four hundred ninety-one thousand, seven hundred eighty".