1251723864 has 64 divisors (see below), whose sum is σ = 3164832000. Its totient is φ = 412530560.

The previous prime is 1251723853. The next prime is 1251723883. The reversal of 1251723864 is 4683271521.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1128142 + ... + 1129250.

It is an arithmetic number, because the mean of its divisors is an integer number (49450500).

Almost surely, 2^1251723864 is an apocalyptic number.

It is an amenable number.

1251723864 is an abundant number, since it is smaller than the sum of its proper divisors (1913108136).

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

1251723864 is a wasteful number, since it uses less digits than its factorization.

1251723864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1608 (or 1604 counting only the distinct ones).

The product of its digits is 80640, while the sum is 39.

The square root of 1251723864 is about 35379.7097783461. The cubic root of 1251723864 is about 1077.7123112048.

The spelling of 1251723864 in words is "one billion, two hundred fifty-one million, seven hundred twenty-three thousand, eight hundred sixty-four".