261828980 has 24 divisors (see below), whose sum is σ = 628389888. Its totient is φ = 89769888.

The previous prime is 261828979. The next prime is 261828991. The reversal of 261828980 is 89828162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 934964 + ... + 935243.

It is an arithmetic number, because the mean of its divisors is an integer number (26182912).

Almost surely, 2^261828980 is an apocalyptic number.

261828980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261828980 is an abundant number, since it is smaller than the sum of its proper divisors (366560908).

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

261828980 is a wasteful number, since it uses less digits than its factorization.

261828980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1870223 (or 1870221 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 44.

The square root of 261828980 is about 16181.1303684261. The cubic root of 261828980 is about 639.7435333077.

The spelling of 261828980 in words is "two hundred sixty-one million, eight hundred twenty-eight thousand, nine hundred eighty".