78725440998 has 64 divisors (see below), whose sum is σ = 185753088000. Its totient is φ = 24629277312.

The previous prime is 78725440979. The next prime is 78725441009. The reversal of 78725440998 is 89904452787.

78725440998 is a `hidden beast` number, since 7 + 87 + 2 + 544 + 0 + 9 + 9 + 8 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 210123 + ... + 449001.

It is an arithmetic number, because the mean of its divisors is an integer number (2902392000).

Almost surely, 2^78725440998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78725440998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92876544000).

78725440998 is an abundant number, since it is smaller than the sum of its proper divisors (107027647002).

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

78725440998 is a wasteful number, since it uses less digits than its factorization.

78725440998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239266 (or 239260 counting only the distinct ones).

The product of its (nonzero) digits is 40642560, while the sum is 63.

The spelling of 78725440998 in words is "seventy-eight billion, seven hundred twenty-five million, four hundred forty thousand, nine hundred ninety-eight".