772497921 has 16 divisors (see below), whose sum is σ = 1117215680. Its totient is φ = 471960000.

The previous prime is 772497917. The next prime is 772497923. The reversal of 772497921 is 129794277.

It is not a de Polignac number, because 772497921 - 2² = 772497917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (772497923) 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 in 15 ways as a sum of consecutive naturals, for example, 65830 + ... + 76671.

It is an arithmetic number, because the mean of its divisors is an integer number (69825980).

Almost surely, 2^772497921 is an apocalyptic number.

It is an amenable number.

772497921 is a deficient number, since it is larger than the sum of its proper divisors (344717759).

772497921 is a wasteful number, since it uses less digits than its factorization.

772497921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142656.

The product of its digits is 444528, while the sum is 48.

The square root of 772497921 is about 27793.8468190353. The cubic root of 772497921 is about 917.5557048544. Note that the first 3 decimals are identical.

The spelling of 772497921 in words is "seven hundred seventy-two million, four hundred ninety-seven thousand, nine hundred twenty-one".