77628212 has 6 divisors (see below), whose sum is σ = 135849378. Its totient is φ = 38814104.

The previous prime is 77628209. The next prime is 77628233. The reversal of 77628212 is 21282677.

It can be written as a sum of positive squares in only one way, i.e., 58583716 + 19044496 = 7654^2 + 4364^2 .

It is a super-2 number, since 2×77628212² = 12052278596633888, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9703523 + ... + 9703530.

It is an arithmetic number, because the mean of its divisors is an integer number (22641563).

Almost surely, 2^77628212 is an apocalyptic number.

It is an amenable number.

77628212 is a deficient number, since it is larger than the sum of its proper divisors (58221166).

77628212 is a wasteful number, since it uses less digits than its factorization.

77628212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19407057 (or 19407055 counting only the distinct ones).

The product of its digits is 18816, while the sum is 35.

The square root of 77628212 is about 8810.6873738659. The cubic root of 77628212 is about 426.5859306330.

The spelling of 77628212 in words is "seventy-seven million, six hundred twenty-eight thousand, two hundred twelve".