80857749 has 32 divisors (see below), whose sum is σ = 130498560. Its totient is φ = 43502400.

The previous prime is 80857747. The next prime is 80857769. The reversal of 80857749 is 94775808.

It is not a de Polignac number, because 80857749 - 2¹ = 80857747 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 80857698 and 80857707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80857741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75679 + ... + 76739.

It is an arithmetic number, because the mean of its divisors is an integer number (4078080).

Almost surely, 2^80857749 is an apocalyptic number.

It is an amenable number.

80857749 is a deficient number, since it is larger than the sum of its proper divisors (49640811).

80857749 is a wasteful number, since it uses less digits than its factorization.

80857749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1281.

The product of its (nonzero) digits is 564480, while the sum is 48.

The square root of 80857749 is about 8992.0936939069. The cubic root of 80857749 is about 432.4214369423.

The spelling of 80857749 in words is "eighty million, eight hundred fifty-seven thousand, seven hundred forty-nine".