55619387 has 8 divisors (see below), whose sum is σ = 56357040. Its totient is φ = 54885600.

The previous prime is 55619381. The next prime is 55619407. The reversal of 55619387 is 78391655.

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 55619387 - 2⁴ = 55619371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55619381) 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, 37553 + ... + 39005.

It is an arithmetic number, because the mean of its divisors is an integer number (7044630).

Almost surely, 2^55619387 is an apocalyptic number.

55619387 is a deficient number, since it is larger than the sum of its proper divisors (737653).

55619387 is a wasteful number, since it uses less digits than its factorization.

55619387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1933.

The product of its digits is 226800, while the sum is 44.

The square root of 55619387 is about 7457.8406392199. The cubic root of 55619387 is about 381.7174957783.

The spelling of 55619387 in words is "fifty-five million, six hundred nineteen thousand, three hundred eighty-seven".