1948778650 has 48 divisors (see below), whose sum is σ = 4461214464. Its totient is φ = 616754880.

The previous prime is 1948778647. The next prime is 1948778687. The reversal of 1948778650 is 568778491.

It is a junction number, because it is equal to n+sod(n) for n = 1948778591 and 1948778600.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 209602 + ... + 218701.

It is an arithmetic number, because the mean of its divisors is an integer number (92941968).

Almost surely, 2^1948778650 is an apocalyptic number.

1948778650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1948778650 is an abundant number, since it is smaller than the sum of its proper divisors (2512435814).

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

1948778650 is a wasteful number, since it uses less digits than its factorization.

1948778650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428335 (or 428330 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 55.

The square root of 1948778650 is about 44144.9731000031. The cubic root of 1948778650 is about 1249.0720900236.

The spelling of 1948778650 in words is "one billion, nine hundred forty-eight million, seven hundred seventy-eight thousand, six hundred fifty".