78233497 has 2 divisors, whose sum is σ = 78233498. Its totient is φ = 78233496.

The previous prime is 78233471. The next prime is 78233501. The reversal of 78233497 is 79433287.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78216336 + 17161 = 8844^2 + 131^2 .

It is an emirp because it is prime and its reverse (79433287) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78233497 - 2¹¹ = 78231449 is a prime.

It is a super-2 number, since 2×78233497² = 12240960105698018, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78233417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39116748 + 39116749.

It is an arithmetic number, because the mean of its divisors is an integer number (39116749).

Almost surely, 2^78233497 is an apocalyptic number.

It is an amenable number.

78233497 is a deficient number, since it is larger than the sum of its proper divisors (1).

78233497 is an equidigital number, since it uses as much as digits as its factorization.

78233497 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 78233497 is about 8844.9701525782. The cubic root of 78233497 is about 427.6917908741.

The spelling of 78233497 in words is "seventy-eight million, two hundred thirty-three thousand, four hundred ninety-seven".