285720645 has 64 divisors (see below), whose sum is σ = 548536320. Its totient is φ = 124243200.

The previous prime is 285720641. The next prime is 285720647. The reversal of 285720645 is 546027582.

It is not a de Polignac number, because 285720645 - 2² = 285720641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285720641) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 197836 + ... + 199274.

It is an arithmetic number, because the mean of its divisors is an integer number (8570880).

Almost surely, 2^285720645 is an apocalyptic number.

It is an amenable number.

285720645 is a deficient number, since it is larger than the sum of its proper divisors (262815675).

285720645 is a wasteful number, since it uses less digits than its factorization.

285720645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1546.

The product of its (nonzero) digits is 134400, while the sum is 39.

The square root of 285720645 is about 16903.2732037319. The cubic root of 285720645 is about 658.6386424857.

The spelling of 285720645 in words is "two hundred eighty-five million, seven hundred twenty thousand, six hundred forty-five".