75307993 has 2 divisors, whose sum is σ = 75307994. Its totient is φ = 75307992.

The previous prime is 75307951. The next prime is 75307997. The reversal of 75307993 is 39970357.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40297104 + 35010889 = 6348^2 + 5917^2 .

It is a cyclic number.

It is not a de Polignac number, because 75307993 - 2¹⁷ = 75176921 is a prime.

It is not a weakly prime, because it can be changed into another prime (75307997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37653996 + 37653997.

It is an arithmetic number, because the mean of its divisors is an integer number (37653997).

Almost surely, 2^75307993 is an apocalyptic number.

It is an amenable number.

75307993 is a deficient number, since it is larger than the sum of its proper divisors (1).

75307993 is an equidigital number, since it uses as much as digits as its factorization.

75307993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 178605, while the sum is 43.

The square root of 75307993 is about 8678.0178036231. The cubic root of 75307993 is about 422.2928139306.

The spelling of 75307993 in words is "seventy-five million, three hundred seven thousand, nine hundred ninety-three".