77491028 has 6 divisors (see below), whose sum is σ = 135609306. Its totient is φ = 38745512.

The previous prime is 77490997. The next prime is 77491039. The reversal of 77491028 is 82019477.

It can be written as a sum of positive squares in only one way, i.e., 67930564 + 9560464 = 8242^2 + 3092^2 .

It is a junction number, because it is equal to n+sod(n) for n = 77490982 and 77491000.

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, 9686375 + ... + 9686382.

It is an arithmetic number, because the mean of its divisors is an integer number (22601551).

Almost surely, 2^77491028 is an apocalyptic number.

It is an amenable number.

77491028 is a deficient number, since it is larger than the sum of its proper divisors (58118278).

77491028 is a wasteful number, since it uses less digits than its factorization.

77491028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19372761 (or 19372759 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 77491028 is about 8802.8988407229. The cubic root of 77491028 is about 426.3344959669.

The spelling of 77491028 in words is "seventy-seven million, four hundred ninety-one thousand, twenty-eight".