748172781 has 20 divisors (see below), whose sum is σ = 1143637792. Its totient is φ = 487180008.

The previous prime is 748172779. The next prime is 748172801. The reversal of 748172781 is 187271847.

It is not a de Polignac number, because 748172781 - 2¹ = 748172779 is a prime.

It is a super-3 number, since 3×748172781³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 (748172701) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 103921 + ... + 110886.

Almost surely, 2^748172781 is an apocalyptic number.

It is an amenable number.

748172781 is a deficient number, since it is larger than the sum of its proper divisors (395465011).

748172781 is a wasteful number, since it uses less digits than its factorization.

748172781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214862 (or 214853 counting only the distinct ones).

The product of its digits is 175616, while the sum is 45.

The square root of 748172781 is about 27352.7472294832. The cubic root of 748172781 is about 907.8218570124.

The spelling of 748172781 in words is "seven hundred forty-eight million, one hundred seventy-two thousand, seven hundred eighty-one".