55764391 has 4 divisors (see below), whose sum is σ = 55845784. Its totient is φ = 55683000.

The previous prime is 55764389. The next prime is 55764409. The reversal of 55764391 is 19346755.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19346755 = 5 ⋅3869351.

It is a cyclic number.

It is not a de Polignac number, because 55764391 - 2¹ = 55764389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55764311) 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, 39660 + ... + 41041.

It is an arithmetic number, because the mean of its divisors is an integer number (13961446).

Almost surely, 2^55764391 is an apocalyptic number.

55764391 is a deficient number, since it is larger than the sum of its proper divisors (81393).

55764391 is an equidigital number, since it uses as much as digits as its factorization.

55764391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81392.

The product of its digits is 113400, while the sum is 40.

The square root of 55764391 is about 7467.5558919904. Note that the first 3 decimals coincide. The cubic root of 55764391 is about 382.0489301650.

The spelling of 55764391 in words is "fifty-five million, seven hundred sixty-four thousand, three hundred ninety-one".