245402640 has 480 divisors, whose sum is σ = 1030648320. Its totient is φ = 51093504.

The previous prime is 245402627. The next prime is 245402657. The reversal of 245402640 is 46204542.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3361644 + ... + 3361716.

It is an arithmetic number, because the mean of its divisors is an integer number (2147184).

Almost surely, 2^245402640 is an apocalyptic number.

245402640 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 245402640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (515324160).

245402640 is an abundant number, since it is smaller than the sum of its proper divisors (785245680).

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

245402640 is a wasteful number, since it uses less digits than its factorization.

245402640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151 (or 142 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

The square root of 245402640 is about 15665.3324254546. The cubic root of 245402640 is about 626.0750691684.

The spelling of 245402640 in words is "two hundred forty-five million, four hundred two thousand, six hundred forty".