261720546 has 16 divisors (see below), whose sum is σ = 523720704. Its totient is φ = 87193584.

The previous prime is 261720539. The next prime is 261720551. The reversal of 261720546 is 645027162.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1695 + ... + 22941.

It is an arithmetic number, because the mean of its divisors is an integer number (32732544).

Almost surely, 2^261720546 is an apocalyptic number.

261720546 is an abundant number, since it is smaller than the sum of its proper divisors (262000158).

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

261720546 is a wasteful number, since it uses less digits than its factorization.

261720546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23305.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 261720546 is about 16177.7793902624. The cubic root of 261720546 is about 639.6552065320.

The spelling of 261720546 in words is "two hundred sixty-one million, seven hundred twenty thousand, five hundred forty-six".