1264697280 has 448 divisors, whose sum is σ = 5565404160. Its totient is φ = 262656000.

The previous prime is 1264697267. The next prime is 1264697299. The reversal of 1264697280 is 827964621.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (448).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 664330 + ... + 666230.

Almost surely, 2^1264697280 is an apocalyptic number.

1264697280 is a gapful number since it is divisible by the number (10) 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 1264697280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2782702080).

1264697280 is an abundant number, since it is smaller than the sum of its proper divisors (4300706880).

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

1264697280 is a wasteful number, since it uses less digits than its factorization.

1264697280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1945 (or 1929 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 1264697280 is about 35562.5825833839. The cubic root of 1264697280 is about 1081.4228160852.

The spelling of 1264697280 in words is "one billion, two hundred sixty-four million, six hundred ninety-seven thousand, two hundred eighty".