28380701 has 4 divisors (see below), whose sum is σ = 30050172. Its totient is φ = 26711232.

The previous prime is 28380673. The next prime is 28380707. The reversal of 28380701 is 10708382.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8791225 + 19589476 = 2965^2 + 4426^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28380701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28380707) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 834710 + ... + 834743.

It is an arithmetic number, because the mean of its divisors is an integer number (7512543).

Almost surely, 2^28380701 is an apocalyptic number.

It is an amenable number.

28380701 is a deficient number, since it is larger than the sum of its proper divisors (1669471).

28380701 is a wasteful number, since it uses less digits than its factorization.

28380701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1669470.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 28380701 is about 5327.3540336644. The cubic root of 28380701 is about 305.0289357122.

The spelling of 28380701 in words is "twenty-eight million, three hundred eighty thousand, seven hundred one".