78156754020 has 144 divisors (see below), whose sum is σ = 252647216640. Its totient is φ = 19511424768.

The previous prime is 78156754009. The next prime is 78156754031. The reversal of 78156754020 is 2045765187.

78156754020 is a `hidden beast` number, since 7 + 81 + 5 + 6 + 7 + 540 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (78156754009) and next prime (78156754031).

It is a super-2 number, since 2×78156754020² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6255 + ... + 395414.

It is an arithmetic number, because the mean of its divisors is an integer number (1754494560).

Almost surely, 2^78156754020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78156754020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126323608320).

78156754020 is an abundant number, since it is smaller than the sum of its proper divisors (174490462620).

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

78156754020 is a wasteful number, since it uses less digits than its factorization.

78156754020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401754 (or 401749 counting only the distinct ones).

The product of its (nonzero) digits is 470400, while the sum is 45.

The spelling of 78156754020 in words is "seventy-eight billion, one hundred fifty-six million, seven hundred fifty-four thousand, twenty".