77028890 has 8 divisors (see below), whose sum is σ = 138652020. Its totient is φ = 30811552.

The previous prime is 77028851. The next prime is 77028899. The reversal of 77028890 is 9882077.

It can be written as a sum of positive squares in 2 ways, for example, as 75498721 + 1530169 = 8689^2 + 1237^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (77028899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3851435 + ... + 3851454.

Almost surely, 2^77028890 is an apocalyptic number.

77028890 is a deficient number, since it is larger than the sum of its proper divisors (61623130).

77028890 is a wasteful number, since it uses less digits than its factorization.

77028890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7702896.

The product of its (nonzero) digits is 56448, while the sum is 41.

The square root of 77028890 is about 8776.6103935403. The cubic root of 77028890 is about 425.4852864949.

The spelling of 77028890 in words is "seventy-seven million, twenty-eight thousand, eight hundred ninety".