67720770 has 48 divisors (see below), whose sum is σ = 189621432. Its totient is φ = 16669440.

The previous prime is 67720753. The next prime is 67720781. The reversal of 67720770 is 7702776.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 21874329 + 45846441 = 4677^2 + 6771^2 .

It is a super-2 number, since 2×67720770² = 9172205378785800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27771 + ... + 30110.

Almost surely, 2^67720770 is an apocalyptic number.

67720770 is an abundant number, since it is smaller than the sum of its proper divisors (121900662).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

67720770 is a wasteful number, since it uses less digits than its factorization.

67720770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57907 (or 57904 counting only the distinct ones).

The product of its (nonzero) digits is 28812, while the sum is 36.

The square root of 67720770 is about 8229.2630289717. The cubic root of 67720770 is about 407.6060571804.

The spelling of 67720770 in words is "sixty-seven million, seven hundred twenty thousand, seven hundred seventy".