280836391972 has 12 divisors (see below), whose sum is σ = 504746488540. Its totient is φ = 136623109536.

The previous prime is 280836391951. The next prime is 280836391991. The reversal of 280836391972 is 279193638082.

It can be written as a sum of positive squares in 2 ways, for example, as 127153575396 + 153682816576 = 356586^2 + 392024^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 948771447 + ... + 948771742.

Almost surely, 2^280836391972 is an apocalyptic number.

It is an amenable number.

280836391972 is a deficient number, since it is larger than the sum of its proper divisors (223910096568).

280836391972 is a wasteful number, since it uses less digits than its factorization.

280836391972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1897543230 (or 1897543228 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 58.

The spelling of 280836391972 in words is "two hundred eighty billion, eight hundred thirty-six million, three hundred ninety-one thousand, nine hundred seventy-two".