261354444 has 36 divisors (see below), whose sum is σ = 660350376. Its totient is φ = 80416128.

The previous prime is 261354433. The next prime is 261354487. The reversal of 261354444 is 444453162.

It is a happy number.

It is a super-2 number, since 2×261354444² = 136612290797098272, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62409 + ... + 66464.

It is an arithmetic number, because the mean of its divisors is an integer number (18343066).

Almost surely, 2^261354444 is an apocalyptic number.

It is an amenable number.

261354444 is an abundant number, since it is smaller than the sum of its proper divisors (398995932).

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

261354444 is a wasteful number, since it uses less digits than its factorization.

261354444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128906 (or 128891 counting only the distinct ones).

The product of its digits is 46080, while the sum is 33.

The square root of 261354444 is about 16166.4604660389. The cubic root of 261354444 is about 639.3568115060.

The spelling of 261354444 in words is "two hundred sixty-one million, three hundred fifty-four thousand, four hundred forty-four".