648724691 has 16 divisors (see below), whose sum is σ = 676349568. Its totient is φ = 621772800.

The previous prime is 648724667. The next prime is 648724721. The reversal of 648724691 is 196427846.

It is a cyclic number.

It is not a de Polignac number, because 648724691 - 2⁶ = 648724627 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (648721691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1011731 + ... + 1012371.

It is an arithmetic number, because the mean of its divisors is an integer number (42271848).

Almost surely, 2^648724691 is an apocalyptic number.

648724691 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

648724691 is a deficient number, since it is larger than the sum of its proper divisors (27624877).

648724691 is a wasteful number, since it uses less digits than its factorization.

648724691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1102.

The product of its digits is 580608, while the sum is 47.

The square root of 648724691 is about 25470.0744207786. The cubic root of 648724691 is about 865.6722100540.

The spelling of 648724691 in words is "six hundred forty-eight million, seven hundred twenty-four thousand, six hundred ninety-one".