55621642 has 4 divisors (see below), whose sum is σ = 83432466. Its totient is φ = 27810820.

The previous prime is 55621627. The next prime is 55621649. The reversal of 55621642 is 24612655.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24612655 = 5 ⋅4922531.

It can be written as a sum of positive squares in only one way, i.e., 51423241 + 4198401 = 7171^2 + 2049^2 .

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 (55621649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13905409 + ... + 13905412.

Almost surely, 2^55621642 is an apocalyptic number.

55621642 is a deficient number, since it is larger than the sum of its proper divisors (27810824).

55621642 is a wasteful number, since it uses less digits than its factorization.

55621642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27810823.

The product of its digits is 14400, while the sum is 31.

The square root of 55621642 is about 7457.9918208590. The cubic root of 55621642 is about 381.7226544191.

The spelling of 55621642 in words is "fifty-five million, six hundred twenty-one thousand, six hundred forty-two".