74428517 has 2 divisors, whose sum is σ = 74428518. Its totient is φ = 74428516.

The previous prime is 74428493. The next prime is 74428547. The reversal of 74428517 is 71582447.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72352036 + 2076481 = 8506^2 + 1441^2 .

It is an emirp because it is prime and its reverse (71582447) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74428517 - 2¹² = 74424421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74428547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37214258 + 37214259.

It is an arithmetic number, because the mean of its divisors is an integer number (37214259).

Almost surely, 2^74428517 is an apocalyptic number.

It is an amenable number.

74428517 is a deficient number, since it is larger than the sum of its proper divisors (1).

74428517 is an equidigital number, since it uses as much as digits as its factorization.

74428517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62720, while the sum is 38.

The square root of 74428517 is about 8627.1963580296. The cubic root of 74428517 is about 420.6424728701.

The spelling of 74428517 in words is "seventy-four million, four hundred twenty-eight thousand, five hundred seventeen".