78247184242 has 4 divisors (see below), whose sum is σ = 117370776366. Its totient is φ = 39123592120.

The previous prime is 78247184221. The next prime is 78247184263. The reversal of 78247184242 is 24248174287.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24248174287 = 3907 ⋅6206341.

It is an interprime number because it is at equal distance from previous prime (78247184221) and next prime (78247184263).

It can be written as a sum of positive squares in only one way, i.e., 50534590401 + 27712593841 = 224799^2 + 166471^2 .

It is a super-2 number, since 2×78247184242² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19561796059 + ... + 19561796062.

Almost surely, 2^78247184242 is an apocalyptic number.

78247184242 is a deficient number, since it is larger than the sum of its proper divisors (39123592124).

78247184242 is a wasteful number, since it uses less digits than its factorization.

78247184242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39123592123.

The product of its digits is 1605632, while the sum is 49.

The spelling of 78247184242 in words is "seventy-eight billion, two hundred forty-seven million, one hundred eighty-four thousand, two hundred forty-two".