261386480 has 40 divisors (see below), whose sum is σ = 622553904. Its totient is φ = 102003200.

The previous prime is 261386473. The next prime is 261386491. The reversal of 261386480 is 84683162.

It is a happy number.

261386480 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

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, 36566 + ... + 43125.

Almost surely, 2^261386480 is an apocalyptic number.

261386480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261386480 is an abundant number, since it is smaller than the sum of its proper divisors (361167424).

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

261386480 is a wasteful number, since it uses less digits than its factorization.

261386480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79745 (or 79739 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 261386480 is about 16167.4512524393. The cubic root of 261386480 is about 639.3829338830.

The spelling of 261386480 in words is "two hundred sixty-one million, three hundred eighty-six thousand, four hundred eighty".