28407973421 has 2 divisors, whose sum is σ = 28407973422. Its totient is φ = 28407973420.

The previous prime is 28407973411. The next prime is 28407973459. The reversal of 28407973421 is 12437970482.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15787922500 + 12620050921 = 125650^2 + 112339^2 .

It is a cyclic number.

It is not a de Polignac number, because 28407973421 - 2⁶ = 28407973357 is a prime.

It is a super-3 number, since 3×28407973421³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28407973411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14203986710 + 14203986711.

It is an arithmetic number, because the mean of its divisors is an integer number (14203986711).

Almost surely, 2^28407973421 is an apocalyptic number.

It is an amenable number.

28407973421 is a deficient number, since it is larger than the sum of its proper divisors (1).

28407973421 is an equidigital number, since it uses as much as digits as its factorization.

28407973421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 677376, while the sum is 47.

The spelling of 28407973421 in words is "twenty-eight billion, four hundred seven million, nine hundred seventy-three thousand, four hundred twenty-one".