28180497 has 8 divisors (see below), whose sum is σ = 39207744. Its totient is φ = 17970128.

The previous prime is 28180487. The next prime is 28180499. The reversal of 28180497 is 79408182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28180497 - 2¹⁴ = 28164113 is a prime.

It is a super-2 number, since 2×28180497² = 1588280822334018, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28180499) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 204138 + ... + 204275.

It is an arithmetic number, because the mean of its divisors is an integer number (4900968).

Almost surely, 2^28180497 is an apocalyptic number.

It is an amenable number.

28180497 is a deficient number, since it is larger than the sum of its proper divisors (11027247).

28180497 is a wasteful number, since it uses less digits than its factorization.

28180497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408439.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 28180497 is about 5308.5305876485. The cubic root of 28180497 is about 304.3099944100.

The spelling of 28180497 in words is "twenty-eight million, one hundred eighty thousand, four hundred ninety-seven".