55019307 has 24 divisors (see below), whose sum is σ = 89832000. Its totient is φ = 29783376.

The previous prime is 55019303. The next prime is 55019323. The reversal of 55019307 is 70391055.

It is a happy number.

It is not a de Polignac number, because 55019307 - 2² = 55019303 is a prime.

It is the 7418-th Hogben number.

It is not an unprimeable number, because it can be changed into a prime (55019303) by changing a digit.

It is a nontrivial repunit in base 7417.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7057 + ... + 12642.

It is an arithmetic number, because the mean of its divisors is an integer number (3743000).

Almost surely, 2^55019307 is an apocalyptic number.

55019307 is a gapful number since it is divisible by the number (57) formed by its first and last digit.

55019307 is a deficient number, since it is larger than the sum of its proper divisors (34812693).

55019307 is a wasteful number, since it uses less digits than its factorization.

55019307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19735 (or 19728 counting only the distinct ones).

The product of its (nonzero) digits is 4725, while the sum is 30.

The square root of 55019307 is about 7417.5000505561. The cubic root of 55019307 is about 380.3397400236.

The spelling of 55019307 in words is "fifty-five million, nineteen thousand, three hundred seven".