47645778 has 8 divisors (see below), whose sum is σ = 95291568. Its totient is φ = 15881924.

The previous prime is 47645737. The next prime is 47645783. The reversal of 47645778 is 87754674.

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

47645778 is an admirable number.

It is a super-2 number, since 2×47645778² = 4540240322450568, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3970476 + ... + 3970487.

It is an arithmetic number, because the mean of its divisors is an integer number (11911446).

Almost surely, 2^47645778 is an apocalyptic number.

47645778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

47645778 is a wasteful number, since it uses less digits than its factorization.

47645778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7940968.

The product of its digits is 1317120, while the sum is 48.

The square root of 47645778 is about 6902.5921218047. The cubic root of 47645778 is about 362.5279325285.

The spelling of 47645778 in words is "forty-seven million, six hundred forty-five thousand, seven hundred seventy-eight".