55390045 has 8 divisors (see below), whose sum is σ = 66682296. Its totient is φ = 44169216.

The previous prime is 55390031. The next prime is 55390051. The reversal of 55390045 is 54009355.

It can be written as a sum of positive squares in 4 ways, for example, as 5631129 + 49758916 = 2373^2 + 7054^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 55390045 - 2⁹ = 55389533 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55389989 and 55390016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16132 + ... + 19261.

It is an arithmetic number, because the mean of its divisors is an integer number (8335287).

Almost surely, 2^55390045 is an apocalyptic number.

It is an amenable number.

55390045 is a deficient number, since it is larger than the sum of its proper divisors (11292251).

55390045 is a wasteful number, since it uses less digits than its factorization.

55390045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35711.

The product of its (nonzero) digits is 13500, while the sum is 31.

The square root of 55390045 is about 7442.4488577349. The cubic root of 55390045 is about 381.1921126838.

The spelling of 55390045 in words is "fifty-five million, three hundred ninety thousand, forty-five".