72770641 has 2 divisors, whose sum is σ = 72770642. Its totient is φ = 72770640.

The previous prime is 72770639. The next prime is 72770651. The reversal of 72770641 is 14607727.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38489616 + 34281025 = 6204^2 + 5855^2 .

It is a cyclic number.

It is not a de Polignac number, because 72770641 - 2¹ = 72770639 is a prime.

Together with 72770639, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 72770597 and 72770606.

It is not a weakly prime, because it can be changed into another prime (72770611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36385320 + 36385321.

It is an arithmetic number, because the mean of its divisors is an integer number (36385321).

Almost surely, 2^72770641 is an apocalyptic number.

It is an amenable number.

72770641 is a deficient number, since it is larger than the sum of its proper divisors (1).

72770641 is an equidigital number, since it uses as much as digits as its factorization.

72770641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16464, while the sum is 34.

The square root of 72770641 is about 8530.5709656505. The cubic root of 72770641 is about 417.4957576630.

The spelling of 72770641 in words is "seventy-two million, seven hundred seventy thousand, six hundred forty-one".