78373249 has 2 divisors, whose sum is σ = 78373250. Its totient is φ = 78373248.

The previous prime is 78373237. The next prime is 78373261. The reversal of 78373249 is 94237387.

It is a balanced prime because it is at equal distance from previous prime (78373237) and next prime (78373261).

It can be written as a sum of positive squares in only one way, i.e., 77563249 + 810000 = 8807^2 + 900^2 .

It is an emirp because it is prime and its reverse (94237387) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78373249 - 2¹³ = 78365057 is a prime.

It is a super-2 number, since 2×78373249² = 12284732317632002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78343249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39186624 + 39186625.

It is an arithmetic number, because the mean of its divisors is an integer number (39186625).

Almost surely, 2^78373249 is an apocalyptic number.

It is an amenable number.

78373249 is a deficient number, since it is larger than the sum of its proper divisors (1).

78373249 is an equidigital number, since it uses as much as digits as its factorization.

78373249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016, while the sum is 43.

The square root of 78373249 is about 8852.8667108457. The cubic root of 78373249 is about 427.9463077171.

The spelling of 78373249 in words is "seventy-eight million, three hundred seventy-three thousand, two hundred forty-nine".