654778403 has 4 divisors (see below), whose sum is σ = 655126920. Its totient is φ = 654429888.

The previous prime is 654778393. The next prime is 654778459. The reversal of 654778403 is 304877456.

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 654778403 - 2¹⁰ = 654777379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (654718403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171425 + ... + 175202.

It is an arithmetic number, because the mean of its divisors is an integer number (163781730).

Almost surely, 2^654778403 is an apocalyptic number.

654778403 is a deficient number, since it is larger than the sum of its proper divisors (348517).

654778403 is a wasteful number, since it uses less digits than its factorization.

654778403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348516.

The product of its (nonzero) digits is 564480, while the sum is 44.

The square root of 654778403 is about 25588.6381622782. The cubic root of 654778403 is about 868.3566118585.

The spelling of 654778403 in words is "six hundred fifty-four million, seven hundred seventy-eight thousand, four hundred three".