261511480 has 16 divisors (see below), whose sum is σ = 588400920. Its totient is φ = 104604576.

The previous prime is 261511469. The next prime is 261511483. The reversal of 261511480 is 84115162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261511483) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3268854 + ... + 3268933.

Almost surely, 2^261511480 is an apocalyptic number.

261511480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261511480 is an abundant number, since it is smaller than the sum of its proper divisors (326889440).

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

261511480 is a wasteful number, since it uses less digits than its factorization.

261511480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6537798 (or 6537794 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 261511480 is about 16171.3165821463. The cubic root of 261511480 is about 639.4848393449.

The spelling of 261511480 in words is "two hundred sixty-one million, five hundred eleven thousand, four hundred eighty".