77857490 has 8 divisors (see below), whose sum is σ = 140143500. Its totient is φ = 31142992.

The previous prime is 77857471. The next prime is 77857499. The reversal of 77857490 is 9475877.

It can be written as a sum of positive squares in 2 ways, for example, as 73290721 + 4566769 = 8561^2 + 2137^2 .

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

It is not an unprimeable number, because it can be changed into a prime (77857499) 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, 3892865 + ... + 3892884.

Almost surely, 2^77857490 is an apocalyptic number.

77857490 is a deficient number, since it is larger than the sum of its proper divisors (62286010).

77857490 is a wasteful number, since it uses less digits than its factorization.

77857490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7785756.

The product of its (nonzero) digits is 493920, while the sum is 47.

The square root of 77857490 is about 8823.6891377700. The cubic root of 77857490 is about 427.0054973176.

The spelling of 77857490 in words is "seventy-seven million, eight hundred fifty-seven thousand, four hundred ninety".