78281453 has 2 divisors, whose sum is σ = 78281454. Its totient is φ = 78281452.

The previous prime is 78281431. The next prime is 78281491. The reversal of 78281453 is 35418287.

It is an a-pointer prime, because the next prime (78281491) can be obtained adding 78281453 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78180964 + 100489 = 8842^2 + 317^2 .

It is a cyclic number.

It is not a de Polignac number, because 78281453 - 2¹² = 78277357 is a prime.

It is a super-2 number, since 2×78281453² = 12255971767582418, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78287453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39140726 + 39140727.

It is an arithmetic number, because the mean of its divisors is an integer number (39140727).

Almost surely, 2^78281453 is an apocalyptic number.

It is an amenable number.

78281453 is a deficient number, since it is larger than the sum of its proper divisors (1).

78281453 is an equidigital number, since it uses as much as digits as its factorization.

78281453 is an evil number, because the sum of its binary digits is even.

The product of its digits is 53760, while the sum is 38.

The square root of 78281453 is about 8847.6806565337. The cubic root of 78281453 is about 427.7791626474.

The spelling of 78281453 in words is "seventy-eight million, two hundred eighty-one thousand, four hundred fifty-three".