649542793 has 4 divisors (see below), whose sum is σ = 677783808. Its totient is φ = 621301780.

The previous prime is 649542781. The next prime is 649542833. The reversal of 649542793 is 397245946.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 397245946 = 2 ⋅198622973.

It is a cyclic number.

It is not a de Polignac number, because 649542793 - 2⁹ = 649542281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649542743) 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, 14120473 + ... + 14120518.

It is an arithmetic number, because the mean of its divisors is an integer number (169445952).

Almost surely, 2^649542793 is an apocalyptic number.

It is an amenable number.

649542793 is a deficient number, since it is larger than the sum of its proper divisors (28241015).

649542793 is a wasteful number, since it uses less digits than its factorization.

649542793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28241014.

The product of its digits is 1632960, while the sum is 49.

The square root of 649542793 is about 25486.1294236689. The cubic root of 649542793 is about 866.0359548389.

The spelling of 649542793 in words is "six hundred forty-nine million, five hundred forty-two thousand, seven hundred ninety-three".