1528724138 has 8 divisors (see below), whose sum is σ = 2293261632. Its totient is φ = 764303596.

The previous prime is 1528724123. The next prime is 1528724147. The reversal of 1528724138 is 8314278251.

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

It is a junction number, because it is equal to n+sod(n) for n = 1528724095 and 1528724104.

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, 20081 + ... + 58827.

It is an arithmetic number, because the mean of its divisors is an integer number (286657704).

Almost surely, 2^1528724138 is an apocalyptic number.

1528724138 is a deficient number, since it is larger than the sum of its proper divisors (764537494).

1528724138 is a wasteful number, since it uses less digits than its factorization.

1528724138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58476.

The product of its digits is 107520, while the sum is 41.

The square root of 1528724138 is about 39098.9020050436. The cubic root of 1528724138 is about 1151.9749649949.

The spelling of 1528724138 in words is "one billion, five hundred twenty-eight million, seven hundred twenty-four thousand, one hundred thirty-eight".