280007978025 has 24 divisors (see below), whose sum is σ = 463239909280. Its totient is φ = 149242947840.

The previous prime is 280007978023. The next prime is 280007978059. The reversal of 280007978025 is 520879700082.

It is not a de Polignac number, because 280007978025 - 2¹ = 280007978023 is a prime.

It is not an unprimeable number, because it can be changed into a prime (280007978021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1063792 + ... + 1300641.

Almost surely, 2^280007978025 is an apocalyptic number.

280007978025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

280007978025 is a deficient number, since it is larger than the sum of its proper divisors (183231931255).

280007978025 is a wasteful number, since it uses less digits than its factorization.

280007978025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2366025 (or 2366020 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 48.

The spelling of 280007978025 in words is "two hundred eighty billion, seven million, nine hundred seventy-eight thousand, twenty-five".