28420377 has 32 divisors (see below), whose sum is σ = 41057280. Its totient is φ = 17451840.

The previous prime is 28420369. The next prime is 28420411. The reversal of 28420377 is 77302482.

It is not a de Polignac number, because 28420377 - 2³ = 28420369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28420577) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 265558 + ... + 265664.

It is an arithmetic number, because the mean of its divisors is an integer number (1283040).

Almost surely, 2^28420377 is an apocalyptic number.

It is an amenable number.

28420377 is a deficient number, since it is larger than the sum of its proper divisors (12636903).

28420377 is a wasteful number, since it uses less digits than its factorization.

28420377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253.

The product of its (nonzero) digits is 18816, while the sum is 33.

The square root of 28420377 is about 5331.0765329340. The cubic root of 28420377 is about 305.1710122213.

The spelling of 28420377 in words is "twenty-eight million, four hundred twenty thousand, three hundred seventy-seven".