245945978 has 4 divisors (see below), whose sum is σ = 368918970. Its totient is φ = 122972988.

The previous prime is 245945977. The next prime is 245945983. The reversal of 245945978 is 879549542.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 143592289 + 102353689 = 11983^2 + 10117^2 .

It is not an unprimeable number, because it can be changed into a prime (245945977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61486493 + ... + 61486496.

Almost surely, 2^245945978 is an apocalyptic number.

245945978 is a deficient number, since it is larger than the sum of its proper divisors (122972992).

245945978 is a wasteful number, since it uses less digits than its factorization.

245945978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122972991.

The product of its digits is 3628800, while the sum is 53.

The square root of 245945978 is about 15682.6648883409. The cubic root of 245945978 is about 626.5367860580.

The spelling of 245945978 in words is "two hundred forty-five million, nine hundred forty-five thousand, nine hundred seventy-eight".