261422890 has 8 divisors (see below), whose sum is σ = 470561220. Its totient is φ = 104569152.

The previous prime is 261422879. The next prime is 261422893. The reversal of 261422890 is 98224162.

It can be written as a sum of positive squares in 2 ways, for example, as 241771401 + 19651489 = 15549^2 + 4433^2 .

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

It is not an unprimeable number, because it can be changed into a prime (261422893) 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, 13071135 + ... + 13071154.

Almost surely, 2^261422890 is an apocalyptic number.

261422890 is a deficient number, since it is larger than the sum of its proper divisors (209138330).

261422890 is a wasteful number, since it uses less digits than its factorization.

261422890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26142296.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 261422890 is about 16168.5772410562. The cubic root of 261422890 is about 639.4126202587.

The spelling of 261422890 in words is "two hundred sixty-one million, four hundred twenty-two thousand, eight hundred ninety".