75720077 has 2 divisors, whose sum is σ = 75720078. Its totient is φ = 75720076.

The previous prime is 75720061. The next prime is 75720089. The reversal of 75720077 is 77002757.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75151561 + 568516 = 8669^2 + 754^2 .

It is a cyclic number.

It is not a de Polignac number, because 75720077 - 2⁴ = 75720061 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75720277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37860038 + 37860039.

It is an arithmetic number, because the mean of its divisors is an integer number (37860039).

Almost surely, 2^75720077 is an apocalyptic number.

It is an amenable number.

75720077 is a deficient number, since it is larger than the sum of its proper divisors (1).

75720077 is an equidigital number, since it uses as much as digits as its factorization.

75720077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24010, while the sum is 35.

The square root of 75720077 is about 8701.7283915323. The cubic root of 75720077 is about 423.0616728294.

The spelling of 75720077 in words is "seventy-five million, seven hundred twenty thousand, seventy-seven".