78529388040 has 96 divisors (see below), whose sum is σ = 257851765080. Its totient is φ = 20725272576.

The previous prime is 78529388033. The next prime is 78529388071. The reversal of 78529388040 is 4088392587.

It is a happy number.

78529388040 is a `hidden beast` number, since 7 + 8 + 529 + 38 + 80 + 4 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 58255615044 + 20273772996 = 241362^2 + 142386^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1089499 + ... + 1159338.

Almost surely, 2^78529388040 is an apocalyptic number.

It is an amenable number.

78529388040 is an abundant number, since it is smaller than the sum of its proper divisors (179322377040).

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

78529388040 is a wasteful number, since it uses less digits than its factorization.

78529388040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2248951 (or 2248944 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 54.

The spelling of 78529388040 in words is "seventy-eight billion, five hundred twenty-nine million, three hundred eighty-eight thousand, forty".