245020643 has 24 divisors (see below), whose sum is σ = 302607648. Its totient is φ = 193669632.

The previous prime is 245020613. The next prime is 245020651. The reversal of 245020643 is 346020542.

It is a de Polignac number, because none of the positive numbers 2^k-245020643 is a prime.

It is a super-2 number, since 2×245020643² = 120070230992266898, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (245020613) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 333905 + ... + 334637.

It is an arithmetic number, because the mean of its divisors is an integer number (12608652).

Almost surely, 2^245020643 is an apocalyptic number.

245020643 is a deficient number, since it is larger than the sum of its proper divisors (57587005).

245020643 is an equidigital number, since it uses as much as digits as its factorization.

245020643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 863 (or 810 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 245020643 is about 15653.1352450555. The cubic root of 245020643 is about 625.7500482175.

The spelling of 245020643 in words is "two hundred forty-five million, twenty thousand, six hundred forty-three".