261426464 has 96 divisors (see below), whose sum is σ = 586776960. Its totient is φ = 113743872.

The previous prime is 261426461. The next prime is 261426467. The reversal of 261426464 is 464624162.

It is an interprime number because it is at equal distance from previous prime (261426461) and next prime (261426467).

It is not an unprimeable number, because it can be changed into a prime (261426461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 851399 + ... + 851705.

It is an arithmetic number, because the mean of its divisors is an integer number (6112260).

Almost surely, 2^261426464 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261426464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (293388480).

261426464 is an abundant number, since it is smaller than the sum of its proper divisors (325350496).

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

261426464 is a wasteful number, since it uses less digits than its factorization.

261426464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442 (or 434 counting only the distinct ones).

The product of its digits is 55296, while the sum is 35.

The square root of 261426464 is about 16168.6877636993. The cubic root of 261426464 is about 639.4155341202.

The spelling of 261426464 in words is "two hundred sixty-one million, four hundred twenty-six thousand, four hundred sixty-four".