1648772658 has 80 divisors (see below), whose sum is σ = 3988353600. Its totient is φ = 506080224.

The previous prime is 1648772627. The next prime is 1648772663. The reversal of 1648772658 is 8562778461.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1260841 + ... + 1262147.

It is an arithmetic number, because the mean of its divisors is an integer number (49854420).

Almost surely, 2^1648772658 is an apocalyptic number.

1648772658 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1648772658, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1994176800).

1648772658 is an abundant number, since it is smaller than the sum of its proper divisors (2339580942).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1648772658 is a wasteful number, since it uses less digits than its factorization.

1648772658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1933 (or 1924 counting only the distinct ones).

The product of its digits is 4515840, while the sum is 54.

The square root of 1648772658 is about 40605.0816770512. The cubic root of 1648772658 is about 1181.3726862746.

The spelling of 1648772658 in words is "one billion, six hundred forty-eight million, seven hundred seventy-two thousand, six hundred fifty-eight".