47640249 has 6 divisors (see below), whose sum is σ = 68813706. Its totient is φ = 31760160.

The previous prime is 47640233. The next prime is 47640251. The reversal of 47640249 is 94204674.

47640249 is a `hidden beast` number, since 4 + 7 + 640 + 2 + 4 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 45968400 + 1671849 = 6780^2 + 1293^2 .

It is not a de Polignac number, because 47640249 - 2⁴ = 47640233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (47640449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2646672 + ... + 2646689.

It is an arithmetic number, because the mean of its divisors is an integer number (11468951).

Almost surely, 2^47640249 is an apocalyptic number.

It is an amenable number.

47640249 is a deficient number, since it is larger than the sum of its proper divisors (21173457).

47640249 is a wasteful number, since it uses less digits than its factorization.

47640249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5293367 (or 5293364 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 47640249 is about 6902.1916084676. The cubic root of 47640249 is about 362.5139089392.

The spelling of 47640249 in words is "forty-seven million, six hundred forty thousand, two hundred forty-nine".