245346640 has 80 divisors (see below), whose sum is σ = 711204480. Its totient is φ = 76469760.

The previous prime is 245346623. The next prime is 245346643. The reversal of 245346640 is 46643542.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 245346596 and 245346605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245346643) 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, 13755 + ... + 26074.

It is an arithmetic number, because the mean of its divisors is an integer number (8890056).

Almost surely, 2^245346640 is an apocalyptic number.

245346640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

245346640 is an abundant number, since it is smaller than the sum of its proper divisors (465857840).

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

245346640 is a wasteful number, since it uses less digits than its factorization.

245346640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39860 (or 39854 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 34.

The square root of 245346640 is about 15663.5449372101. The cubic root of 245346640 is about 626.0274428524.

The spelling of 245346640 in words is "two hundred forty-five million, three hundred forty-six thousand, six hundred forty".