1550728 has 8 divisors (see below), whose sum is σ = 2907630. Its totient is φ = 775360.

The previous prime is 1550701. The next prime is 1550737. The reversal of 1550728 is 8270551.

It can be written as a sum of positive squares in only one way, i.e., 1340964 + 209764 = 1158^2 + 458^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1550696 and 1550705.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96913 + ... + 96928.

2^1550728 is an apocalyptic number.

It is an amenable number.

1550728 is a deficient number, since it is larger than the sum of its proper divisors (1356902).

1550728 is a wasteful number, since it uses less digits than its factorization.

1550728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193847 (or 193843 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 1550728 is about 1245.2822973125. The cubic root of 1550728 is about 115.7475683940.

It can be divided in two parts, 1550 and 728, that added together give a triangular number (2278 = T₆₇).

The spelling of 1550728 in words is "one million, five hundred fifty thousand, seven hundred twenty-eight".