1272450816 has 648 divisors, whose sum is σ = 5007513840. Its totient is φ = 315850752.

The previous prime is 1272450793. The next prime is 1272450857. The reversal of 1272450816 is 6180542721.

1272450816 is a `hidden beast` number, since 127 + 2 + 450 + 81 + 6 = 666.

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 71 ways as a sum of consecutive naturals, for example, 74850040 + ... + 74850056.

Almost surely, 2^1272450816 is an apocalyptic number.

1272450816 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 1272450816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2503756920).

1272450816 is an abundant number, since it is smaller than the sum of its proper divisors (3735063024).

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

1272450816 is a wasteful number, since it uses less digits than its factorization.

1272450816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86 (or 42 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 1272450816 is about 35671.4285668517. The cubic root of 1272450816 is about 1083.6282908304.

The spelling of 1272450816 in words is "one billion, two hundred seventy-two million, four hundred fifty thousand, eight hundred sixteen".