1648638723 has 8 divisors (see below), whose sum is σ = 2239660368. Its totient is φ = 1078354784.

The previous prime is 1648638713. The next prime is 1648638727. The reversal of 1648638723 is 3278368461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1648638723 - 2⁴ = 1648638707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1648638727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5184240 + ... + 5184557.

It is an arithmetic number, because the mean of its divisors is an integer number (279957546).

Almost surely, 2^1648638723 is an apocalyptic number.

1648638723 is a deficient number, since it is larger than the sum of its proper divisors (591021645).

1648638723 is a wasteful number, since it uses less digits than its factorization.

1648638723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10368853.

The product of its digits is 1161216, while the sum is 48.

The square root of 1648638723 is about 40603.4324041700. The cubic root of 1648638723 is about 1181.3406965327.

The spelling of 1648638723 in words is "one billion, six hundred forty-eight million, six hundred thirty-eight thousand, seven hundred twenty-three".