73778128 has 10 divisors (see below), whose sum is σ = 142945154. Its totient is φ = 36889056.

The previous prime is 73778123. The next prime is 73778161. The reversal of 73778128 is 82187737.

It can be written as a sum of positive squares in only one way, i.e., 67765824 + 6012304 = 8232^2 + 2452^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73778123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2305551 + ... + 2305582.

Almost surely, 2^73778128 is an apocalyptic number.

It is an amenable number.

73778128 is a deficient number, since it is larger than the sum of its proper divisors (69167026).

73778128 is a wasteful number, since it uses less digits than its factorization.

73778128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4611141 (or 4611135 counting only the distinct ones).

The product of its digits is 131712, while the sum is 43.

The square root of 73778128 is about 8589.4195380130. The cubic root of 73778128 is about 419.4136337521.

The spelling of 73778128 in words is "seventy-three million, seven hundred seventy-eight thousand, one hundred twenty-eight".