78284453 has 4 divisors (see below), whose sum is σ = 84306348. Its totient is φ = 72262560.

The previous prime is 78284449. The next prime is 78284461. The reversal of 78284453 is 35448287.

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 3928324 + 74356129 = 1982^2 + 8623^2 .

It is a cyclic number.

It is not a de Polignac number, because 78284453 - 2² = 78284449 is a prime.

It is a super-2 number, since 2×78284453² = 12256911163018418, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78284453.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78284413) 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, 3010928 + ... + 3010953.

It is an arithmetic number, because the mean of its divisors is an integer number (21076587).

Almost surely, 2^78284453 is an apocalyptic number.

It is an amenable number.

78284453 is a deficient number, since it is larger than the sum of its proper divisors (6021895).

78284453 is a wasteful number, since it uses less digits than its factorization.

78284453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6021894.

The product of its digits is 215040, while the sum is 41.

The square root of 78284453 is about 8847.8501908656. The cubic root of 78284453 is about 427.7846272074.

The spelling of 78284453 in words is "seventy-eight million, two hundred eighty-four thousand, four hundred fifty-three".