72705011 has 2 divisors, whose sum is σ = 72705012. Its totient is φ = 72705010.

The previous prime is 72704993. The next prime is 72705019. The reversal of 72705011 is 11050727.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72705011 - 2²² = 68510707 is a prime.

It is not a weakly prime, because it can be changed into another prime (72705019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36352505 + 36352506.

It is an arithmetic number, because the mean of its divisors is an integer number (36352506).

Almost surely, 2^72705011 is an apocalyptic number.

72705011 is a deficient number, since it is larger than the sum of its proper divisors (1).

72705011 is an equidigital number, since it uses as much as digits as its factorization.

72705011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 490, while the sum is 23.

The square root of 72705011 is about 8526.7233448729. The cubic root of 72705011 is about 417.3702102924.

Adding to 72705011 its reverse (11050727), we get a palindrome (83755738).

The spelling of 72705011 in words is "seventy-two million, seven hundred five thousand, eleven".