53978657820 has 24 divisors (see below), whose sum is σ = 151140242064. Its totient is φ = 14394308736.

The previous prime is 53978657819. The next prime is 53978657833. The reversal of 53978657820 is 2875687935.

It is a Harshad number since it is a multiple of its sum of digits (60), and also a Moran number because the ratio is a prime number: 899644297 = 53978657820 / (5 + 3 + 9 + 7 + 8 + 6 + 5 + 7 + 8 + 2 + 0).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 449822089 + ... + 449822208.

It is an arithmetic number, because the mean of its divisors is an integer number (6297510086).

Almost surely, 2^53978657820 is an apocalyptic number.

It is an amenable number.

53978657820 is an abundant number, since it is smaller than the sum of its proper divisors (97161584244).

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

53978657820 is a wasteful number, since it uses less digits than its factorization.

53978657820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 899644309 (or 899644307 counting only the distinct ones).

The product of its (nonzero) digits is 25401600, while the sum is 60.

The spelling of 53978657820 in words is "fifty-three billion, nine hundred seventy-eight million, six hundred fifty-seven thousand, eight hundred twenty".