77928433 has 4 divisors (see below), whose sum is σ = 85012848. Its totient is φ = 70844020.

The previous prime is 77928407. The next prime is 77928457. The reversal of 77928433 is 33482977.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 33482977 = 11 ⋅3043907.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77928433 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77928433.

It is not an unprimeable number, because it can be changed into a prime (77928233) 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, 3542191 + ... + 3542212.

It is an arithmetic number, because the mean of its divisors is an integer number (21253212).

Almost surely, 2^77928433 is an apocalyptic number.

It is an amenable number.

77928433 is a deficient number, since it is larger than the sum of its proper divisors (7084415).

77928433 is a wasteful number, since it uses less digits than its factorization.

77928433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7084414.

The product of its digits is 254016, while the sum is 43.

The square root of 77928433 is about 8827.7082529952. The cubic root of 77928433 is about 427.1351523867.

The spelling of 77928433 in words is "seventy-seven million, nine hundred twenty-eight thousand, four hundred thirty-three".