1390267664 has 20 divisors (see below), whose sum is σ = 2780536320. Its totient is φ = 672709920.

The previous prime is 1390267597. The next prime is 1390267687. The reversal of 1390267664 is 4667620931.

1390267664 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1400984 + ... + 1401975.

It is an arithmetic number, because the mean of its divisors is an integer number (139026816).

Almost surely, 2^1390267664 is an apocalyptic number.

It is an amenable number.

1390267664 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1390267664 is a wasteful number, since it uses less digits than its factorization.

1390267664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2802998 (or 2802992 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 44.

The square root of 1390267664 is about 37286.2932456419. The cubic root of 1390267664 is about 1116.0906603635.

It can be divided in two parts, 1390267 and 664, that added together give a palindrome (1390931).

The spelling of 1390267664 in words is "one billion, three hundred ninety million, two hundred sixty-seven thousand, six hundred sixty-four".