99990757 has 2 divisors, whose sum is σ = 99990758. Its totient is φ = 99990756.

The previous prime is 99990739. The next prime is 99990799. The reversal of 99990757 is 75709999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78747876 + 21242881 = 8874^2 + 4609^2 .

It is a cyclic number.

It is not a de Polignac number, because 99990757 - 2¹⁹ = 99466469 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 99990698 and 99990707.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99991757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49995378 + 49995379.

It is an arithmetic number, because the mean of its divisors is an integer number (49995379).

Almost surely, 2^99990757 is an apocalyptic number.

It is an amenable number.

99990757 is a deficient number, since it is larger than the sum of its proper divisors (1).

99990757 is an equidigital number, since it uses as much as digits as its factorization.

99990757 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1607445, while the sum is 55.

The square root of 99990757 is about 9999.5378393204. The cubic root of 99990757 is about 464.1445821855.

The spelling of 99990757 in words is "ninety-nine million, nine hundred ninety thousand, seven hundred fifty-seven".