78247447738 has 8 divisors (see below), whose sum is σ = 118856882880. Its totient is φ = 38628486780.

The previous prime is 78247447717. The next prime is 78247447757. The reversal of 78247447738 is 83774474287.

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

It is a super-2 number, since 2×78247447738² (a number of 23 digits) contains 22 as substring.

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, 247618348 + ... + 247618663.

It is an arithmetic number, because the mean of its divisors is an integer number (14857110360).

Almost surely, 2^78247447738 is an apocalyptic number.

78247447738 is a deficient number, since it is larger than the sum of its proper divisors (40609435142).

78247447738 is a wasteful number, since it uses less digits than its factorization.

78247447738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495237092.

The product of its digits is 59006976, while the sum is 61.

The spelling of 78247447738 in words is "seventy-eight billion, two hundred forty-seven million, four hundred forty-seven thousand, seven hundred thirty-eight".