542642721 has 8 divisors (see below), whose sum is σ = 724046400. Its totient is φ = 361500432.

The previous prime is 542642713. The next prime is 542642731. The reversal of 542642721 is 127246245.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 542642721 - 2³ = 542642713 is a prime.

It is a super-2 number, since 2×542642721² = 588922245308567682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (542642731) 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, 60450 + ... + 68843.

It is an arithmetic number, because the mean of its divisors is an integer number (90505800).

Almost surely, 2^542642721 is an apocalyptic number.

It is an amenable number.

542642721 is a deficient number, since it is larger than the sum of its proper divisors (181403679).

542642721 is a wasteful number, since it uses less digits than its factorization.

542642721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130695.

The product of its digits is 26880, while the sum is 33.

The square root of 542642721 is about 23294.6929793032. The cubic root of 542642721 is about 815.6515401707.

Adding to 542642721 its reverse (127246245), we get a palindrome (669888966).

The spelling of 542642721 in words is "five hundred forty-two million, six hundred forty-two thousand, seven hundred twenty-one".