80781723 has 12 divisors (see below), whose sum is σ = 127292568. Its totient is φ = 48958560.

The previous prime is 80781721. The next prime is 80781737. The reversal of 80781723 is 32718708.

It is not a de Polignac number, because 80781723 - 2¹ = 80781721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (80781721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 407890 + ... + 408087.

It is an arithmetic number, because the mean of its divisors is an integer number (10607714).

Almost surely, 2^80781723 is an apocalyptic number.

80781723 is a deficient number, since it is larger than the sum of its proper divisors (46510845).

80781723 is a wasteful number, since it uses less digits than its factorization.

80781723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815994 (or 815991 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 80781723 is about 8987.8653194182. The cubic root of 80781723 is about 432.2858672472.

It can be divided in two parts, 8078 and 1723, that added together give a square (9801 = 99²).

The spelling of 80781723 in words is "eighty million, seven hundred eighty-one thousand, seven hundred twenty-three".