54008721 has 16 divisors (see below), whose sum is σ = 86168320. Its totient is φ = 33235920.

The previous prime is 54008707. The next prime is 54008723. The reversal of 54008721 is 12780045.

54008721 = 495² + 496² + ... + 656².

It is not a de Polignac number, because 54008721 - 2¹⁰ = 54007697 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (54008723) 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, 76585 + ... + 77286.

It is an arithmetic number, because the mean of its divisors is an integer number (5385520).

Almost surely, 2^54008721 is an apocalyptic number.

It is an amenable number.

54008721 is a deficient number, since it is larger than the sum of its proper divisors (32159599).

54008721 is a wasteful number, since it uses less digits than its factorization.

54008721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153893 (or 153887 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 54008721 is about 7349.0625932836. The cubic root of 54008721 is about 377.9966615981.

Adding to 54008721 its reverse (12780045), we get a palindrome (66788766).

The spelling of 54008721 in words is "fifty-four million, eight thousand, seven hundred twenty-one".