261445464 has 48 divisors (see below), whose sum is σ = 809237520. Its totient is φ = 74698560.

The previous prime is 261445427. The next prime is 261445487. The reversal of 261445464 is 464544162.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 258867 + ... + 259874.

It is an arithmetic number, because the mean of its divisors is an integer number (16859115).

Almost surely, 2^261445464 is an apocalyptic number.

261445464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

261445464 is an abundant number, since it is smaller than the sum of its proper divisors (547792056).

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

261445464 is a wasteful number, since it uses less digits than its factorization.

261445464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518760 (or 518753 counting only the distinct ones).

The product of its digits is 92160, while the sum is 36.

The square root of 261445464 is about 16169.2753084361. The cubic root of 261445464 is about 639.4310242644.

The spelling of 261445464 in words is "two hundred sixty-one million, four hundred forty-five thousand, four hundred sixty-four".