1551428736 has 256 divisors, whose sum is σ = 5099673600. Its totient is φ = 410849280.

The previous prime is 1551428713. The next prime is 1551428761. The reversal of 1551428736 is 6378241551.

It is a happy number.

It is a super-2 number, since 2×1551428736² = 4813862245773115392, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1042585 + ... + 1044071.

It is an arithmetic number, because the mean of its divisors is an integer number (19920600).

Almost surely, 2^1551428736 is an apocalyptic number.

1551428736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1551428736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2549836800).

1551428736 is an abundant number, since it is smaller than the sum of its proper divisors (3548244864).

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

1551428736 is a wasteful number, since it uses less digits than its factorization.

1551428736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1547 (or 1535 counting only the distinct ones).

The product of its digits is 201600, while the sum is 42.

The square root of 1551428736 is about 39388.1801559808. The cubic root of 1551428736 is about 1157.6500026559.

It can be divided in two parts, 155142 and 8736, that added together give a triangular number (163878 = T₅₇₂).

The spelling of 1551428736 in words is "one billion, five hundred fifty-one million, four hundred twenty-eight thousand, seven hundred thirty-six".