261380350 has 48 divisors (see below), whose sum is σ = 606139776. Its totient is φ = 81468000.

The previous prime is 261380347. The next prime is 261380377. The reversal of 261380350 is 53083162.

It is a super-2 number, since 2×261380350² = 136639374732245000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30096 + ... + 37795.

It is an arithmetic number, because the mean of its divisors is an integer number (12627912).

Almost surely, 2^261380350 is an apocalyptic number.

261380350 is an abundant number, since it is smaller than the sum of its proper divisors (344759426).

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

261380350 is a wasteful number, since it uses less digits than its factorization.

261380350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67921 (or 67916 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 261380350 is about 16167.2616728993. The cubic root of 261380350 is about 639.3779356035.

The spelling of 261380350 in words is "two hundred sixty-one million, three hundred eighty thousand, three hundred fifty".