1252763890 has 24 divisors (see below), whose sum is σ = 2623135212. Its totient is φ = 429518880.

The previous prime is 1252763867. The next prime is 1252763891. The reversal of 1252763890 is 983672521.

It can be written as a sum of positive squares in 2 ways, for example, as 1195292329 + 57471561 = 34573^2 + 7581^2 .

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (1252763891) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1277841 + ... + 1278820.

Almost surely, 2^1252763890 is an apocalyptic number.

1252763890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1252763890 is an abundant number, since it is smaller than the sum of its proper divisors (1370371322).

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

1252763890 is a wasteful number, since it uses less digits than its factorization.

1252763890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2556682 (or 2556675 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 1252763890 is about 35394.4047838073. The cubic root of 1252763890 is about 1078.0107099627.

The spelling of 1252763890 in words is "one billion, two hundred fifty-two million, seven hundred sixty-three thousand, eight hundred ninety".