73557428 has 72 divisors (see below), whose sum is σ = 156251592. Its totient is φ = 30191616.

The previous prime is 73557383. The next prime is 73557431. The reversal of 73557428 is 82475537.

It can be written as a sum of positive squares in 4 ways, for example, as 17875984 + 55681444 = 4228^2 + 7462^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 758276 + ... + 758372.

It is an arithmetic number, because the mean of its divisors is an integer number (2170161).

Almost surely, 2^73557428 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 73557428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78125796).

73557428 is an abundant number, since it is smaller than the sum of its proper divisors (82694164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

73557428 is a wasteful number, since it uses less digits than its factorization.

73557428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241 (or 232 counting only the distinct ones).

The product of its digits is 235200, while the sum is 41.

The square root of 73557428 is about 8576.5627147477. The cubic root of 73557428 is about 418.9950045257.

The spelling of 73557428 in words is "seventy-three million, five hundred fifty-seven thousand, four hundred twenty-eight".