261780454 has 8 divisors (see below), whose sum is σ = 422876160. Its totient is φ = 120821736.

The previous prime is 261780437. The next prime is 261780511. The reversal of 261780454 is 454087162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×261780454² = 137058012192892232, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5034214 + ... + 5034265.

It is an arithmetic number, because the mean of its divisors is an integer number (52859520).

Almost surely, 2^261780454 is an apocalyptic number.

261780454 is a deficient number, since it is larger than the sum of its proper divisors (161095706).

261780454 is a wasteful number, since it uses less digits than its factorization.

261780454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10068494.

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 261780454 is about 16179.6308363325. The cubic root of 261780454 is about 639.7040086369.

The spelling of 261780454 in words is "two hundred sixty-one million, seven hundred eighty thousand, four hundred fifty-four".