65720731 has 2 divisors, whose sum is σ = 65720732. Its totient is φ = 65720730.

The previous prime is 65720719. The next prime is 65720737. The reversal of 65720731 is 13702756.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65720731 - 2¹³ = 65712539 is a prime.

It is a super-2 number, since 2×65720731² = 8638428966348722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 65720693 and 65720702.

It is not a weakly prime, because it can be changed into another prime (65720737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32860365 + 32860366.

It is an arithmetic number, because the mean of its divisors is an integer number (32860366).

Almost surely, 2^65720731 is an apocalyptic number.

65720731 is a deficient number, since it is larger than the sum of its proper divisors (1).

65720731 is an equidigital number, since it uses as much as digits as its factorization.

65720731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8820, while the sum is 31.

The square root of 65720731 is about 8106.8323653570. The cubic root of 65720731 is about 403.5531997211.

The spelling of 65720731 in words is "sixty-five million, seven hundred twenty thousand, seven hundred thirty-one".