78190261444 has 6 divisors (see below), whose sum is σ = 136832957534. Its totient is φ = 39095130720.

The previous prime is 78190261339. The next prime is 78190261463. The reversal of 78190261444 is 44416209187.

It can be written as a sum of positive squares in only one way, i.e., 53494138944 + 24696122500 = 231288^2 + 157150^2 .

It is a super-2 number, since 2×78190261444² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78190261394 and 78190261403.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9773782677 + ... + 9773782684.

Almost surely, 2^78190261444 is an apocalyptic number.

It is an amenable number.

78190261444 is a deficient number, since it is larger than the sum of its proper divisors (58642696090).

78190261444 is a wasteful number, since it uses less digits than its factorization.

78190261444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19547565365 (or 19547565363 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 46.

The spelling of 78190261444 in words is "seventy-eight billion, one hundred ninety million, two hundred sixty-one thousand, four hundred forty-four".