261620022 has 8 divisors (see below), whose sum is σ = 523240056. Its totient is φ = 87206672.

The previous prime is 261619951. The next prime is 261620119. The reversal of 261620022 is 220026162.

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

261620022 is an admirable number.

It is a super-2 number, since 2×261620022² = 136890071822560968, which contains 22 as substring.

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, 21801663 + ... + 21801674.

It is an arithmetic number, because the mean of its divisors is an integer number (65405007).

Almost surely, 2^261620022 is an apocalyptic number.

261620022 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

261620022 is a wasteful number, since it uses less digits than its factorization.

261620022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43603342.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 261620022 is about 16174.6722377920. The cubic root of 261620022 is about 639.5733011879.

Adding to 261620022 its reverse (220026162), we get a palindrome (481646184).

The spelling of 261620022 in words is "two hundred sixty-one million, six hundred twenty thousand, twenty-two".