78215020274 has 4 divisors (see below), whose sum is σ = 117322530414. Its totient is φ = 39107510136.

The previous prime is 78215020259. The next prime is 78215020277. The reversal of 78215020274 is 47202051287.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 75044767249 + 3170253025 = 273943^2 + 56305^2 .

It is a super-2 number, since 2×78215020274² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78215020277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19553755067 + ... + 19553755070.

Almost surely, 2^78215020274 is an apocalyptic number.

78215020274 is a deficient number, since it is larger than the sum of its proper divisors (39107510140).

78215020274 is a wasteful number, since it uses less digits than its factorization.

78215020274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39107510139.

The product of its (nonzero) digits is 62720, while the sum is 38.

The spelling of 78215020274 in words is "seventy-eight billion, two hundred fifteen million, twenty thousand, two hundred seventy-four".