78574513 has 2 divisors, whose sum is σ = 78574514. Its totient is φ = 78574512.

The previous prime is 78574471. The next prime is 78574537. The reversal of 78574513 is 31547587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40233649 + 38340864 = 6343^2 + 6192^2 .

It is a cyclic number.

It is not a de Polignac number, because 78574513 - 2²¹ = 76477361 is a prime.

It is not a weakly prime, because it can be changed into another prime (78574213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39287256 + 39287257.

It is an arithmetic number, because the mean of its divisors is an integer number (39287257).

Almost surely, 2^78574513 is an apocalyptic number.

It is an amenable number.

78574513 is a deficient number, since it is larger than the sum of its proper divisors (1).

78574513 is an equidigital number, since it uses as much as digits as its factorization.

78574513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 117600, while the sum is 40.

The square root of 78574513 is about 8864.2265878079. The cubic root of 78574513 is about 428.3123193507.

The spelling of 78574513 in words is "seventy-eight million, five hundred seventy-four thousand, five hundred thirteen".