52478991 has 24 divisors (see below), whose sum is σ = 77366016. Its totient is φ = 34272720.

The previous prime is 52478981. The next prime is 52479013. The reversal of 52478991 is 19987425.

It is not a de Polignac number, because 52478991 - 2⁶ = 52478927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52478911) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 121546 + ... + 121976.

It is an arithmetic number, because the mean of its divisors is an integer number (3223584).

Almost surely, 2^52478991 is an apocalyptic number.

52478991 is a deficient number, since it is larger than the sum of its proper divisors (24887025).

52478991 is a wasteful number, since it uses less digits than its factorization.

52478991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683 (or 680 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 52478991 is about 7244.2384692941. The cubic root of 52478991 is about 374.3936654843.

The spelling of 52478991 in words is "fifty-two million, four hundred seventy-eight thousand, nine hundred ninety-one".