261678988 has 6 divisors (see below), whose sum is σ = 457938236. Its totient is φ = 130839492.

The previous prime is 261678973. The next prime is 261679007. The reversal of 261678988 is 889876162.

It is a zygodrome in base 2.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32709870 + ... + 32709877.

Almost surely, 2^261678988 is an apocalyptic number.

It is an amenable number.

261678988 is a deficient number, since it is larger than the sum of its proper divisors (196259248).

261678988 is a wasteful number, since it uses less digits than its factorization.

261678988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65419751 (or 65419749 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 55.

The square root of 261678988 is about 16176.4949231903. The cubic root of 261678988 is about 639.6213482831.

The spelling of 261678988 in words is "two hundred sixty-one million, six hundred seventy-eight thousand, nine hundred eighty-eight".