7978238578 has 8 divisors (see below), whose sum is σ = 12036533868. Its totient is φ = 3966060624.

The previous prime is 7978238557. The next prime is 7978238629. The reversal of 7978238578 is 8758328797.

It can be written as a sum of positive squares in 2 ways, for example, as 5857912369 + 2120326209 = 76537^2 + 46047^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11528901 + ... + 11529592.

Almost surely, 2^7978238578 is an apocalyptic number.

7978238578 is a deficient number, since it is larger than the sum of its proper divisors (4058295290).

7978238578 is a wasteful number, since it uses less digits than its factorization.

7978238578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23058668.

The product of its digits is 47416320, while the sum is 64.

The square root of 7978238578 is about 89320.9862126477. The cubic root of 7978238578 is about 1998.1849013735.

The spelling of 7978238578 in words is "seven billion, nine hundred seventy-eight million, two hundred thirty-eight thousand, five hundred seventy-eight".