245687649 has 8 divisors (see below), whose sum is σ = 329281632. Its totient is φ = 162942720.

The previous prime is 245687639. The next prime is 245687657. The reversal of 245687649 is 946786542.

245687649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 245687649 - 2⁷ = 245687521 is a prime.

It is a super-2 number, since 2×245687649² = 120724841742294402, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (245687639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 211587 + ... + 212744.

It is an arithmetic number, because the mean of its divisors is an integer number (41160204).

Almost surely, 2^245687649 is an apocalyptic number.

It is an amenable number.

245687649 is a deficient number, since it is larger than the sum of its proper divisors (83593983).

245687649 is a wasteful number, since it uses less digits than its factorization.

245687649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424527.

The product of its digits is 2903040, while the sum is 51.

The square root of 245687649 is about 15674.4265923829. The cubic root of 245687649 is about 626.3173485443.

The spelling of 245687649 in words is "two hundred forty-five million, six hundred eighty-seven thousand, six hundred forty-nine".