47813618 has 4 divisors (see below), whose sum is σ = 71720430. Its totient is φ = 23906808.

The previous prime is 47813609. The next prime is 47813621. The reversal of 47813618 is 81631874.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81631874 = 2 ⋅40815937.

It can be written as a sum of positive squares in only one way, i.e., 40615129 + 7198489 = 6373^2 + 2683^2 .

It is a super-2 number, since 2×47813618² = 4572284132499848, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11953403 + ... + 11953406.

Almost surely, 2^47813618 is an apocalyptic number.

47813618 is a deficient number, since it is larger than the sum of its proper divisors (23906812).

47813618 is a wasteful number, since it uses less digits than its factorization.

47813618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23906811.

The product of its digits is 32256, while the sum is 38.

The square root of 47813618 is about 6914.7391852477. The cubic root of 47813618 is about 362.9531215155.

The spelling of 47813618 in words is "forty-seven million, eight hundred thirteen thousand, six hundred eighteen".