55319787 has 16 divisors (see below), whose sum is σ = 82072480. Its totient is φ = 36827136.

The previous prime is 55319777. The next prime is 55319809. The reversal of 55319787 is 78791355.

55319787 is a `hidden beast` number, since 553 + 1 + 97 + 8 + 7 = 666.

It is not a de Polignac number, because 55319787 - 2¹⁰ = 55318763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55319777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30243 + ... + 32019.

It is an arithmetic number, because the mean of its divisors is an integer number (5129530).

Almost surely, 2^55319787 is an apocalyptic number.

55319787 is a deficient number, since it is larger than the sum of its proper divisors (26752693).

55319787 is a wasteful number, since it uses less digits than its factorization.

55319787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2939 (or 2933 counting only the distinct ones).

The product of its digits is 264600, while the sum is 45.

The square root of 55319787 is about 7437.7272738384. The cubic root of 55319787 is about 381.0308735599.

The spelling of 55319787 in words is "fifty-five million, three hundred nineteen thousand, seven hundred eighty-seven".