75720739 has 2 divisors, whose sum is σ = 75720740. Its totient is φ = 75720738.

The previous prime is 75720709. The next prime is 75720767. The reversal of 75720739 is 93702757.

It is a strong prime.

It is an emirp because it is prime and its reverse (93702757) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 75720739 - 2¹³ = 75712547 is a prime.

It is a super-2 number, since 2×75720739² = 11467260629412242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (75720709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37860369 + 37860370.

It is an arithmetic number, because the mean of its divisors is an integer number (37860370).

Almost surely, 2^75720739 is an apocalyptic number.

75720739 is a deficient number, since it is larger than the sum of its proper divisors (1).

75720739 is an equidigital number, since it uses as much as digits as its factorization.

75720739 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 92610, while the sum is 40.

The square root of 75720739 is about 8701.7664298693. The cubic root of 75720739 is about 423.0629057301.

The spelling of 75720739 in words is "seventy-five million, seven hundred twenty thousand, seven hundred thirty-nine".