81767376 has 30 divisors (see below), whose sum is σ = 228835490. Its totient is φ = 27255744.

The previous prime is 81767251. The next prime is 81767419. The reversal of 81767376 is 67376718.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 81000000 + 767376 = 9000^2 + 876^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 283771 + ... + 284058.

Almost surely, 2^81767376 is an apocalyptic number.

It is an amenable number.

81767376 is an abundant number, since it is smaller than the sum of its proper divisors (147068114).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81767376 is a wasteful number, since it uses less digits than its factorization.

81767376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567843 (or 567834 counting only the distinct ones).

The product of its digits is 296352, while the sum is 45.

The square root of 81767376 is about 9042.5315039540. The cubic root of 81767376 is about 434.0369340042.

It can be divided in two parts, 81 and 767376, that multiplied together give a square (62157456 = 7884²).

The spelling of 81767376 in words is "eighty-one million, seven hundred sixty-seven thousand, three hundred seventy-six".