78190457 has 2 divisors, whose sum is σ = 78190458. Its totient is φ = 78190456.

The previous prime is 78190433. The next prime is 78190459. The reversal of 78190457 is 75409187.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71554681 + 6635776 = 8459^2 + 2576^2 .

It is a cyclic number.

It is not a de Polignac number, because 78190457 - 2⁶ = 78190393 is a prime.

It is a super-2 number, since 2×78190457² = 12227495131737698, which contains 22 as substring.

Together with 78190459, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78190459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39095228 + 39095229.

It is an arithmetic number, because the mean of its divisors is an integer number (39095229).

Almost surely, 2^78190457 is an apocalyptic number.

It is an amenable number.

78190457 is a deficient number, since it is larger than the sum of its proper divisors (1).

78190457 is an equidigital number, since it uses as much as digits as its factorization.

78190457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70560, while the sum is 41.

The square root of 78190457 is about 8842.5367966438. The cubic root of 78190457 is about 427.6133452291.

The spelling of 78190457 in words is "seventy-eight million, one hundred ninety thousand, four hundred fifty-seven".