261922478 has 8 divisors (see below), whose sum is σ = 393361272. Its totient is φ = 130802056.

The previous prime is 261922447. The next prime is 261922501. The reversal of 261922478 is 874229162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

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, 77525 + ... + 80832.

It is an arithmetic number, because the mean of its divisors is an integer number (49170159).

Almost surely, 2^261922478 is an apocalyptic number.

261922478 is a deficient number, since it is larger than the sum of its proper divisors (131438794).

261922478 is a wasteful number, since it uses less digits than its factorization.

261922478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159186.

The product of its digits is 96768, while the sum is 41.

The square root of 261922478 is about 16184.0192164987. The cubic root of 261922478 is about 639.8196741312.

The spelling of 261922478 in words is "two hundred sixty-one million, nine hundred twenty-two thousand, four hundred seventy-eight".