28474421 has 2 divisors, whose sum is σ = 28474422. Its totient is φ = 28474420.

The previous prime is 28474387. The next prime is 28474427. The reversal of 28474421 is 12447482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25959025 + 2515396 = 5095^2 + 1586^2 .

It is a cyclic number.

It is not a de Polignac number, because 28474421 - 2⁶ = 28474357 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28474427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14237210 + 14237211.

It is an arithmetic number, because the mean of its divisors is an integer number (14237211).

Almost surely, 2^28474421 is an apocalyptic number.

It is an amenable number.

28474421 is a deficient number, since it is larger than the sum of its proper divisors (1).

28474421 is an equidigital number, since it uses as much as digits as its factorization.

28474421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14336, while the sum is 32.

The square root of 28474421 is about 5336.1428953880. The cubic root of 28474421 is about 305.3643267939.

The spelling of 28474421 in words is "twenty-eight million, four hundred seventy-four thousand, four hundred twenty-one".