1531212768 has 48 divisors (see below), whose sum is σ = 4466039760. Its totient is φ = 510403968.

The previous prime is 1531212733. The next prime is 1531212779. The reversal of 1531212768 is 8672121351.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×1531212768² = 4689225081772443648, which contains 22 as substring.

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

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, 885255 + ... + 886982.

It is an arithmetic number, because the mean of its divisors is an integer number (93042495).

Almost surely, 2^1531212768 is an apocalyptic number.

1531212768 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1531212768 is an abundant number, since it is smaller than the sum of its proper divisors (2934826992).

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

1531212768 is a wasteful number, since it uses less digits than its factorization.

1531212768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1772256 (or 1772242 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 1531212768 is about 39130.7138703091. The cubic root of 1531212768 is about 1152.5997311286.

The spelling of 1531212768 in words is "one billion, five hundred thirty-one million, two hundred twelve thousand, seven hundred sixty-eight".