1653768978 has 16 divisors (see below), whose sum is σ = 3377911680. Its totient is φ = 539527376.

The previous prime is 1653768967. The next prime is 1653768979. The reversal of 1653768978 is 8798673561.

It is not an unprimeable number, because it can be changed into a prime (1653768979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2931933 + ... + 2932496.

It is an arithmetic number, because the mean of its divisors is an integer number (211119480).

Almost surely, 2^1653768978 is an apocalyptic number.

1653768978 is an abundant number, since it is smaller than the sum of its proper divisors (1724142702).

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

1653768978 is a wasteful number, since it uses less digits than its factorization.

1653768978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5864481.

The product of its digits is 15240960, while the sum is 60.

The square root of 1653768978 is about 40666.5584725337. The cubic root of 1653768978 is about 1182.5647980320.

The spelling of 1653768978 in words is "one billion, six hundred fifty-three million, seven hundred sixty-eight thousand, nine hundred seventy-eight".