55578739 has 4 divisors (see below), whose sum is σ = 56934360. Its totient is φ = 54223120.

The previous prime is 55578713. The next prime is 55578749. The reversal of 55578739 is 93787555.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55578739 - 2⁵ = 55578707 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55578692 and 55578701.

It is not an unprimeable number, because it can be changed into a prime (55578749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 677749 + ... + 677830.

It is an arithmetic number, because the mean of its divisors is an integer number (14233590).

Almost surely, 2^55578739 is an apocalyptic number.

55578739 is a deficient number, since it is larger than the sum of its proper divisors (1355621).

55578739 is a wasteful number, since it uses less digits than its factorization.

55578739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1355620.

The product of its digits is 1323000, while the sum is 49.

The square root of 55578739 is about 7455.1149555188. The cubic root of 55578739 is about 381.6244836412.

The spelling of 55578739 in words is "fifty-five million, five hundred seventy-eight thousand, seven hundred thirty-nine".