245778157890 has 48 divisors (see below), whose sum is σ = 639148426488. Its totient is φ = 65527999488.

The previous prime is 245778157879. The next prime is 245778157921. The reversal of 245778157890 is 98751877542.

245778157890 is a `hidden beast` number, since 2 + 4 + 57 + 7 + 8 + 1 + 578 + 9 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 239411554209 + 6366603681 = 489297^2 + 79791^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 198792 + ... + 728748.

Almost surely, 2^245778157890 is an apocalyptic number.

245778157890 is an abundant number, since it is smaller than the sum of its proper divisors (393370268598).

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

245778157890 is a wasteful number, since it uses less digits than its factorization.

245778157890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535123 (or 535120 counting only the distinct ones).

The product of its (nonzero) digits is 39513600, while the sum is 63.

The spelling of 245778157890 in words is "two hundred forty-five billion, seven hundred seventy-eight million, one hundred fifty-seven thousand, eight hundred ninety".