74425781 has 2 divisors, whose sum is σ = 74425782. Its totient is φ = 74425780.

The previous prime is 74425777. The next prime is 74425787. The reversal of 74425781 is 18752447.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40436881 + 33988900 = 6359^2 + 5830^2 .

It is a cyclic number.

It is not a de Polignac number, because 74425781 - 2² = 74425777 is a prime.

It is a super-2 number, since 2×74425781² = 11078393754919922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74425787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37212890 + 37212891.

It is an arithmetic number, because the mean of its divisors is an integer number (37212891).

Almost surely, 2^74425781 is an apocalyptic number.

It is an amenable number.

74425781 is a deficient number, since it is larger than the sum of its proper divisors (1).

74425781 is an equidigital number, since it uses as much as digits as its factorization.

74425781 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 74425781 is about 8627.0377882562. The cubic root of 74425781 is about 420.6373185200.

The spelling of 74425781 in words is "seventy-four million, four hundred twenty-five thousand, seven hundred eighty-one".