77020728 has 32 divisors (see below), whose sum is σ = 192796800. Its totient is φ = 25640928.

The previous prime is 77020711. The next prime is 77020739. The reversal of 77020728 is 82702077.

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 in 7 ways as a sum of consecutive naturals, for example, 24003 + ... + 27021.

It is an arithmetic number, because the mean of its divisors is an integer number (6024900).

Almost surely, 2^77020728 is an apocalyptic number.

It is an amenable number.

77020728 is an abundant number, since it is smaller than the sum of its proper divisors (115776072).

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

77020728 is a wasteful number, since it uses less digits than its factorization.

77020728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4091 (or 4087 counting only the distinct ones).

The product of its (nonzero) digits is 10976, while the sum is 33.

The square root of 77020728 is about 8776.1453953316. The cubic root of 77020728 is about 425.4702577891.

The spelling of 77020728 in words is "seventy-seven million, twenty thousand, seven hundred twenty-eight".