261463642 has 16 divisors (see below), whose sum is σ = 438286464. Its totient is φ = 115948000.

The previous prime is 261463639. The next prime is 261463661. The reversal of 261463642 is 246364162.

It is a junction number, because it is equal to n+sod(n) for n = 261463598 and 261463607.

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 7 ways as a sum of consecutive naturals, for example, 144034 + ... + 145837.

It is an arithmetic number, because the mean of its divisors is an integer number (27392904).

Almost surely, 2^261463642 is an apocalyptic number.

261463642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

261463642 is a deficient number, since it is larger than the sum of its proper divisors (176822822).

261463642 is a wasteful number, since it uses less digits than its factorization.

261463642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289925.

The product of its digits is 41472, while the sum is 34.

The square root of 261463642 is about 16169.8374141486. The cubic root of 261463642 is about 639.4458435535.

The spelling of 261463642 in words is "two hundred sixty-one million, four hundred sixty-three thousand, six hundred forty-two".