71778226738 has 8 divisors (see below), whose sum is σ = 110577268332. Its totient is φ = 34919137296.

The previous prime is 71778226721. The next prime is 71778226753. The reversal of 71778226738 is 83762287717.

It can be written as a sum of positive squares in 2 ways, for example, as 52215449049 + 19562777689 = 228507^2 + 139867^2 .

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

It is a super-2 number, since 2×71778226738² (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, 484987945 + ... + 484988092.

Almost surely, 2^71778226738 is an apocalyptic number.

71778226738 is a deficient number, since it is larger than the sum of its proper divisors (38799041594).

71778226738 is a wasteful number, since it uses less digits than its factorization.

71778226738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 969976076.

The product of its digits is 11063808, while the sum is 58.

The spelling of 71778226738 in words is "seventy-one billion, seven hundred seventy-eight million, two hundred twenty-six thousand, seven hundred thirty-eight".