1264647420 has 72 divisors (see below), whose sum is σ = 3939796224. Its totient is φ = 328123008.

The previous prime is 1264647389. The next prime is 1264647421. The reversal of 1264647420 is 247464621.

1264647420 is a `hidden beast` number, since 1 + 2 + 6 + 4 + 647 + 4 + 2 + 0 = 666.

1264647420 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264647421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 88284 + ... + 101603.

It is an arithmetic number, because the mean of its divisors is an integer number (54719392).

Almost surely, 2^1264647420 is an apocalyptic number.

1264647420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1264647420 is an abundant number, since it is smaller than the sum of its proper divisors (2675148804).

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

1264647420 is a wasteful number, since it uses less digits than its factorization.

1264647420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189939 (or 189934 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 36.

The square root of 1264647420 is about 35561.8815587702. The cubic root of 1264647420 is about 1081.4086043970.

The spelling of 1264647420 in words is "one billion, two hundred sixty-four million, six hundred forty-seven thousand, four hundred twenty".