1264349780 has 24 divisors (see below), whose sum is σ = 2691509352. Its totient is φ = 498811392.

The previous prime is 1264349747. The next prime is 1264349797. The reversal of 1264349780 is 879434621.

It can be written as a sum of positive squares in 4 ways, for example, as 138344644 + 1126005136 = 11762^2 + 33556^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 431537 + ... + 434456.

It is an arithmetic number, because the mean of its divisors is an integer number (112146223).

Almost surely, 2^1264349780 is an apocalyptic number.

1264349780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1264349780 is an abundant number, since it is smaller than the sum of its proper divisors (1427159572).

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

1264349780 is a wasteful number, since it uses less digits than its factorization.

1264349780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866075 (or 866073 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 1264349780 is about 35557.6964945706. The cubic root of 1264349780 is about 1081.3237597448.

The spelling of 1264349780 in words is "one billion, two hundred sixty-four million, three hundred forty-nine thousand, seven hundred eighty".