1269722664 has 96 divisors (see below), whose sum is σ = 3938425920. Its totient is φ = 362009088.

The previous prime is 1269722647. The next prime is 1269722687. The reversal of 1269722664 is 4662279621.

It is a super-2 number, since 2×1269722664² = 3224391286950513792, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

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, 261184 + ... + 266000.

It is an arithmetic number, because the mean of its divisors is an integer number (41025270).

Almost surely, 2^1269722664 is an apocalyptic number.

1269722664 is a gapful number since it is divisible by the number (14) 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 1269722664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1969212960).

1269722664 is an abundant number, since it is smaller than the sum of its proper divisors (2668703256).

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

1269722664 is a wasteful number, since it uses less digits than its factorization.

1269722664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5359 (or 5352 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 1269722664 is about 35633.1680320456. The cubic root of 1269722664 is about 1082.8532987295.

The spelling of 1269722664 in words is "one billion, two hundred sixty-nine million, seven hundred twenty-two thousand, six hundred sixty-four".