78354473 has 2 divisors, whose sum is σ = 78354474. Its totient is φ = 78354472.

The previous prime is 78354467. The next prime is 78354517. The reversal of 78354473 is 37445387.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50865424 + 27489049 = 7132^2 + 5243^2 .

It is a cyclic number.

It is not a de Polignac number, because 78354473 - 2¹⁴ = 78338089 is a prime.

It is a super-2 number, since 2×78354473² = 12278846878215458, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78354473.

It is not a weakly prime, because it can be changed into another prime (78354413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39177236 + 39177237.

It is an arithmetic number, because the mean of its divisors is an integer number (39177237).

Almost surely, 2^78354473 is an apocalyptic number.

It is an amenable number.

78354473 is a deficient number, since it is larger than the sum of its proper divisors (1).

78354473 is an equidigital number, since it uses as much as digits as its factorization.

78354473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 282240, while the sum is 41.

The square root of 78354473 is about 8851.8061998668. The cubic root of 78354473 is about 427.9121304023.

The spelling of 78354473 in words is "seventy-eight million, three hundred fifty-four thousand, four hundred seventy-three".