55240145 has 8 divisors (see below), whose sum is σ = 66332520. Its totient is φ = 44162560.

The previous prime is 55240139. The next prime is 55240147. The reversal of 55240145 is 54104255.

It can be written as a sum of positive squares in 4 ways, for example, as 583696 + 54656449 = 764^2 + 7393^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-55240145 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55240147) 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, 7751 + ... + 13059.

It is an arithmetic number, because the mean of its divisors is an integer number (8291565).

Almost surely, 2^55240145 is an apocalyptic number.

It is an amenable number.

55240145 is a deficient number, since it is larger than the sum of its proper divisors (11092375).

55240145 is a wasteful number, since it uses less digits than its factorization.

55240145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7395.

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 55240145 is about 7432.3714250567. The cubic root of 55240145 is about 380.8479333808.

The spelling of 55240145 in words is "fifty-five million, two hundred forty thousand, one hundred forty-five".