77228128 has 12 divisors (see below), whose sum is σ = 152042940. Its totient is φ = 38614048.

The previous prime is 77228117. The next prime is 77228149. The reversal of 77228128 is 82182277.

It is a happy number.

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, 1206658 + ... + 1206721.

It is an arithmetic number, because the mean of its divisors is an integer number (12670245).

Almost surely, 2^77228128 is an apocalyptic number.

It is an amenable number.

77228128 is a deficient number, since it is larger than the sum of its proper divisors (74814812).

77228128 is a wasteful number, since it uses less digits than its factorization.

77228128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2413389 (or 2413381 counting only the distinct ones).

The product of its digits is 25088, while the sum is 37.

The square root of 77228128 is about 8787.9535729315. The cubic root of 77228128 is about 425.8518150057.

It can be divided in two parts, 772 and 28128, that added together give a square (28900 = 170²).

The spelling of 77228128 in words is "seventy-seven million, two hundred twenty-eight thousand, one hundred twenty-eight".