772723621 has 2 divisors, whose sum is σ = 772723622. Its totient is φ = 772723620.

The previous prime is 772723619. The next prime is 772723643. The reversal of 772723621 is 126327277.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 579124225 + 193599396 = 24065^2 + 13914^2 .

It is a cyclic number.

It is not a de Polignac number, because 772723621 - 2¹ = 772723619 is a prime.

Together with 772723619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (772723691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 386361810 + 386361811.

It is an arithmetic number, because the mean of its divisors is an integer number (386361811).

Almost surely, 2^772723621 is an apocalyptic number.

It is an amenable number.

772723621 is a deficient number, since it is larger than the sum of its proper divisors (1).

772723621 is an equidigital number, since it uses as much as digits as its factorization.

772723621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 49392, while the sum is 37.

The square root of 772723621 is about 27797.9067737123. The cubic root of 772723621 is about 917.6450566190.

The spelling of 772723621 in words is "seven hundred seventy-two million, seven hundred twenty-three thousand, six hundred twenty-one".