76722381 has 6 divisors (see below), whose sum is σ = 110821230. Its totient is φ = 51148248.

The previous prime is 76722353. The next prime is 76722383. The reversal of 76722381 is 18322767.

It can be written as a sum of positive squares in only one way, i.e., 67322025 + 9400356 = 8205^2 + 3066^2 .

It is not a de Polignac number, because 76722381 - 2¹³ = 76714189 is a prime.

It is a super-2 number, since 2×76722381² = 11772647492618322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76722383) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4262346 + ... + 4262363.

It is an arithmetic number, because the mean of its divisors is an integer number (18470205).

Almost surely, 2^76722381 is an apocalyptic number.

It is an amenable number.

76722381 is a deficient number, since it is larger than the sum of its proper divisors (34098849).

76722381 is a wasteful number, since it uses less digits than its factorization.

76722381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8524715 (or 8524712 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 76722381 is about 8759.1312925427. The cubic root of 76722381 is about 424.9201806271.

The spelling of 76722381 in words is "seventy-six million, seven hundred twenty-two thousand, three hundred eighty-one".