70780278656 has 128 divisors (see below), whose sum is σ = 157124880000. Its totient is φ = 31617202176.

The previous prime is 70780278649. The next prime is 70780278671. The reversal of 70780278656 is 65687208707.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3021035 + ... + 3044373.

It is an arithmetic number, because the mean of its divisors is an integer number (1227538125).

Almost surely, 2^70780278656 is an apocalyptic number.

70780278656 is a gapful number since it is divisible by the number (76) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 70780278656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78562440000).

70780278656 is an abundant number, since it is smaller than the sum of its proper divisors (86344601344).

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

70780278656 is a wasteful number, since it uses less digits than its factorization.

70780278656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23444 (or 23432 counting only the distinct ones).

The product of its (nonzero) digits is 7902720, while the sum is 56.

The spelling of 70780278656 in words is "seventy billion, seven hundred eighty million, two hundred seventy-eight thousand, six hundred fifty-six".