54721642 has 4 divisors (see below), whose sum is σ = 82082466. Its totient is φ = 27360820.

The previous prime is 54721613. The next prime is 54721649. The reversal of 54721642 is 24612745.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 28291761 + 26429881 = 5319^2 + 5141^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (54721649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13680409 + ... + 13680412.

Almost surely, 2^54721642 is an apocalyptic number.

54721642 is a deficient number, since it is larger than the sum of its proper divisors (27360824).

54721642 is a wasteful number, since it uses less digits than its factorization.

54721642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27360823.

The product of its digits is 13440, while the sum is 31.

The square root of 54721642 is about 7397.4077892191. The cubic root of 54721642 is about 379.6525956962.

The spelling of 54721642 in words is "fifty-four million, seven hundred twenty-one thousand, six hundred forty-two".