5245638978 has 32 divisors (see below), whose sum is σ = 11050280640. Its totient is φ = 1655493120.

The previous prime is 5245638977. The next prime is 5245638989. The reversal of 5245638978 is 8798365425.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (5245638977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 182826 + ... + 209562.

It is an arithmetic number, because the mean of its divisors is an integer number (345321270).

Almost surely, 2^5245638978 is an apocalyptic number.

5245638978 is an abundant number, since it is smaller than the sum of its proper divisors (5804641662).

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

5245638978 is a wasteful number, since it uses less digits than its factorization.

5245638978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28482.

The product of its digits is 14515200, while the sum is 57.

The square root of 5245638978 is about 72426.7835679592. The cubic root of 5245638978 is about 1737.5319501259.

The spelling of 5245638978 in words is "five billion, two hundred forty-five million, six hundred thirty-eight thousand, nine hundred seventy-eight".