77243428 has 12 divisors (see below), whose sum is σ = 136570252. Its totient is φ = 38223360.

The previous prime is 77243399. The next prime is 77243431. The reversal of 77243428 is 82434277.

It can be written as a sum of positive squares in 2 ways, for example, as 10036224 + 67207204 = 3168^2 + 8198^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99153 + ... + 99928.

Almost surely, 2^77243428 is an apocalyptic number.

It is an amenable number.

77243428 is a deficient number, since it is larger than the sum of its proper divisors (59326824).

77243428 is a wasteful number, since it uses less digits than its factorization.

77243428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199182 (or 199180 counting only the distinct ones).

The product of its digits is 75264, while the sum is 37.

The square root of 77243428 is about 8788.8240396540. The cubic root of 77243428 is about 425.8799355999.

The spelling of 77243428 in words is "seventy-seven million, two hundred forty-three thousand, four hundred twenty-eight".