67720525 has 6 divisors (see below), whose sum is σ = 83973482. Its totient is φ = 54176400.

The previous prime is 67720507. The next prime is 67720531. The reversal of 67720525 is 52502776.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 18636489 + 49084036 = 4317^2 + 7006^2 .

It is not a de Polignac number, because 67720525 - 2⁵ = 67720493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 1354386 + ... + 1354435.

Almost surely, 2^67720525 is an apocalyptic number.

It is an amenable number.

67720525 is a deficient number, since it is larger than the sum of its proper divisors (16252957).

67720525 is a wasteful number, since it uses less digits than its factorization.

67720525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2708831 (or 2708826 counting only the distinct ones).

The product of its (nonzero) digits is 29400, while the sum is 34.

The square root of 67720525 is about 8229.2481430566. The cubic root of 67720525 is about 407.6055656345.

The spelling of 67720525 in words is "sixty-seven million, seven hundred twenty thousand, five hundred twenty-five".