47711640 has 32 divisors (see below), whose sum is σ = 143135280. Its totient is φ = 12723072.

The previous prime is 47711623. The next prime is 47711647. The reversal of 47711640 is 4611774.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 47711598 and 47711607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47711647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198679 + ... + 198918.

Almost surely, 2^47711640 is an apocalyptic number.

47711640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

47711640 is an abundant number, since it is smaller than the sum of its proper divisors (95423640).

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

47711640 is a wasteful number, since it uses less digits than its factorization.

47711640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397611 (or 397607 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 47711640 is about 6907.3612906811. The cubic root of 47711640 is about 362.6948995526.

The spelling of 47711640 in words is "forty-seven million, seven hundred eleven thousand, six hundred forty".