55148787 has 6 divisors (see below), whose sum is σ = 79659372. Its totient is φ = 36765852.

The previous prime is 55148729. The next prime is 55148789. The reversal of 55148787 is 78784155.

It is a happy number.

It is not a de Polignac number, because 55148787 - 2¹⁹ = 54624499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55148789) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3063813 + ... + 3063830.

It is an arithmetic number, because the mean of its divisors is an integer number (13276562).

Almost surely, 2^55148787 is an apocalyptic number.

55148787 is a deficient number, since it is larger than the sum of its proper divisors (24510585).

55148787 is a wasteful number, since it uses less digits than its factorization.

55148787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6127649 (or 6127646 counting only the distinct ones).

The product of its digits is 313600, while the sum is 45.

The square root of 55148787 is about 7426.2229295921. Note that the first 3 decimals coincide. The cubic root of 55148787 is about 380.6378645138.

The spelling of 55148787 in words is "fifty-five million, one hundred forty-eight thousand, seven hundred eighty-seven".