47775988 has 24 divisors (see below), whose sum is σ = 92239560. Its totient is φ = 21511680.

The previous prime is 47775979. The next prime is 47775989. The reversal of 47775988 is 88957774.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 138384 + 47637604 = 372^2 + 6902^2 .

It is a super-2 number, since 2×47775988² = 4565090058752288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47775989) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 9073 + ... + 13336.

It is an arithmetic number, because the mean of its divisors is an integer number (3843315).

Almost surely, 2^47775988 is an apocalyptic number.

It is an amenable number.

47775988 is a deficient number, since it is larger than the sum of its proper divisors (44463572).

47775988 is a wasteful number, since it uses less digits than its factorization.

47775988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22467 (or 22465 counting only the distinct ones).

The product of its digits is 3951360, while the sum is 55.

The square root of 47775988 is about 6912.0176504404. The cubic root of 47775988 is about 362.8578800962.

The spelling of 47775988 in words is "forty-seven million, seven hundred seventy-five thousand, nine hundred eighty-eight".