260779987 has 4 divisors (see below), whose sum is σ = 280840000. Its totient is φ = 240719976.

The previous prime is 260779979. The next prime is 260780011. The reversal of 260779987 is 789977062.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 260779987 - 2³ = 260779979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (260779927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10029987 + ... + 10030012.

It is an arithmetic number, because the mean of its divisors is an integer number (70210000).

Almost surely, 2^260779987 is an apocalyptic number.

260779987 is a deficient number, since it is larger than the sum of its proper divisors (20060013).

260779987 is a wasteful number, since it uses less digits than its factorization.

260779987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20060012.

The product of its (nonzero) digits is 2667168, while the sum is 55.

The square root of 260779987 is about 16148.6837544117. The cubic root of 260779987 is about 638.8880325108. Note that the first 3 decimals are identical.

The spelling of 260779987 in words is "two hundred sixty million, seven hundred seventy-nine thousand, nine hundred eighty-seven".