261750378 has 16 divisors (see below), whose sum is σ = 525290976. Its totient is φ = 86951760.

The previous prime is 261750361. The next prime is 261750383. The reversal of 261750378 is 873057162.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72688 + ... + 76203.

It is an arithmetic number, because the mean of its divisors is an integer number (32830686).

Almost surely, 2^261750378 is an apocalyptic number.

261750378 is an abundant number, since it is smaller than the sum of its proper divisors (263540598).

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

261750378 is a wasteful number, since it uses less digits than its factorization.

261750378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149189.

The product of its (nonzero) digits is 70560, while the sum is 39.

The square root of 261750378 is about 16178.7013693930. The cubic root of 261750378 is about 639.6795091319.

The spelling of 261750378 in words is "two hundred sixty-one million, seven hundred fifty thousand, three hundred seventy-eight".