81672376 has 8 divisors (see below), whose sum is σ = 153135720. Its totient is φ = 40836184.

The previous prime is 81672373. The next prime is 81672401. The reversal of 81672376 is 67327618.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81672373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5104516 + ... + 5104531.

It is an arithmetic number, because the mean of its divisors is an integer number (19141965).

Almost surely, 2^81672376 is an apocalyptic number.

It is an amenable number.

81672376 is a deficient number, since it is larger than the sum of its proper divisors (71463344).

81672376 is a wasteful number, since it uses less digits than its factorization.

81672376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10209053 (or 10209049 counting only the distinct ones).

The product of its digits is 84672, while the sum is 40.

The square root of 81672376 is about 9037.2770235287. The cubic root of 81672376 is about 433.8687761158.

The spelling of 81672376 in words is "eighty-one million, six hundred seventy-two thousand, three hundred seventy-six".