80821725 has 48 divisors (see below), whose sum is σ = 144038400. Its totient is φ = 39856320.

The previous prime is 80821721. The next prime is 80821729. The reversal of 80821725 is 52712808.

It is an interprime number because it is at equal distance from previous prime (80821721) and next prime (80821729).

It is not a de Polignac number, because 80821725 - 2² = 80821721 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80821721) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 60616 + ... + 61934.

It is an arithmetic number, because the mean of its divisors is an integer number (3000800).

Almost surely, 2^80821725 is an apocalyptic number.

It is an amenable number.

80821725 is a deficient number, since it is larger than the sum of its proper divisors (63216675).

80821725 is a wasteful number, since it uses less digits than its factorization.

80821725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1394 (or 1389 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 80821725 is about 8990.0903777437. The cubic root of 80821725 is about 432.3572094811.

The spelling of 80821725 in words is "eighty million, eight hundred twenty-one thousand, seven hundred twenty-five".