47428781 has 16 divisors (see below), whose sum is σ = 50139648. Its totient is φ = 44822400.

The previous prime is 47428763. The next prime is 47428811. The reversal of 47428781 is 18782474.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47428781 is a prime.

It is a super-2 number, since 2×47428781² = 4498978534291922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47428721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 203441 + ... + 203673.

It is an arithmetic number, because the mean of its divisors is an integer number (3133728).

Almost surely, 2^47428781 is an apocalyptic number.

It is an amenable number.

47428781 is a deficient number, since it is larger than the sum of its proper divisors (2710867).

47428781 is a wasteful number, since it uses less digits than its factorization.

47428781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412.

The product of its digits is 100352, while the sum is 41.

The square root of 47428781 is about 6886.8556685907. The cubic root of 47428781 is about 361.9767315101.

The spelling of 47428781 in words is "forty-seven million, four hundred twenty-eight thousand, seven hundred eighty-one".