47991764 has 12 divisors (see below), whose sum is σ = 84501984. Its totient is φ = 23848344.

The previous prime is 47991763. The next prime is 47991767. The reversal of 47991764 is 46719974.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47991763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36152 + ... + 37455.

It is an arithmetic number, because the mean of its divisors is an integer number (7041832).

Almost surely, 2^47991764 is an apocalyptic number.

It is an amenable number.

47991764 is a deficient number, since it is larger than the sum of its proper divisors (36510220).

47991764 is a wasteful number, since it uses less digits than its factorization.

47991764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73774 (or 73772 counting only the distinct ones).

The product of its digits is 381024, while the sum is 47.

The square root of 47991764 is about 6927.6088226747. The cubic root of 47991764 is about 363.4033315369.

The spelling of 47991764 in words is "forty-seven million, nine hundred ninety-one thousand, seven hundred sixty-four".