1557226044 has 72 divisors (see below), whose sum is σ = 4546786608. Its totient is φ = 444126720.

The previous prime is 1557225991. The next prime is 1557226051. The reversal of 1557226044 is 4406227551.

It is a happy number.

1557226044 is a `hidden beast` number, since 1 + 557 + 2 + 2 + 60 + 44 = 666.

It is a super-2 number, since 2×1557226044² = 4849905904223779872, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 108927 + ... + 122390.

It is an arithmetic number, because the mean of its divisors is an integer number (63149814).

Almost surely, 2^1557226044 is an apocalyptic number.

It is an amenable number.

1557226044 is an abundant number, since it is smaller than the sum of its proper divisors (2989560564).

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

1557226044 is a wasteful number, since it uses less digits than its factorization.

1557226044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231355 (or 231350 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 36.

The square root of 1557226044 is about 39461.7035111258. The cubic root of 1557226044 is about 1159.0901615111.

It can be divided in two parts, 15572 and 26044, that added together give a triangular number (41616 = T₂₈₈).

The spelling of 1557226044 in words is "one billion, five hundred fifty-seven million, two hundred twenty-six thousand, forty-four".