1213547328 has 504 divisors, whose sum is σ = 4456907520. Its totient is φ = 313528320.

The previous prime is 1213547281. The next prime is 1213547353. The reversal of 1213547328 is 8237453121.

It is a tau number, because it is divible by the number of its divisors (504).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

It is a junction number, because it is equal to n+sod(n) for n = 1213547292 and 1213547301.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 16623900 + ... + 16623972.

Almost surely, 2^1213547328 is an apocalyptic number.

1213547328 is a gapful number since it is divisible by the number (18) 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 1213547328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2228453760).

1213547328 is an abundant number, since it is smaller than the sum of its proper divisors (3243360192).

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

1213547328 is a wasteful number, since it uses less digits than its factorization.

1213547328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155 (or 135 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 1213547328 is about 34836.0062004817. The cubic root of 1213547328 is about 1066.6425543160.

The spelling of 1213547328 in words is "one billion, two hundred thirteen million, five hundred forty-seven thousand, three hundred twenty-eight".