1258316640 has 192 divisors, whose sum is σ = 5033387520. Its totient is φ = 287608320.

The previous prime is 1258316639. The next prime is 1258316651. The reversal of 1258316640 is 466138521.

It is a happy number.

1258316640 is a `hidden beast` number, since 1 + 2 + 5 + 8 + 3 + 1 + 6 + 640 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 1258316595 and 1258316604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9435 + ... + 51045.

It is an arithmetic number, because the mean of its divisors is an integer number (26215560).

Almost surely, 2^1258316640 is an apocalyptic number.

1258316640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1258316640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2516693760).

1258316640 is an abundant number, since it is smaller than the sum of its proper divisors (3775070880).

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

1258316640 is a wasteful number, since it uses less digits than its factorization.

1258316640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41642 (or 41628 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 1258316640 is about 35472.7591258419. The cubic root of 1258316640 is about 1079.6010872422.

The spelling of 1258316640 in words is "one billion, two hundred fifty-eight million, three hundred sixteen thousand, six hundred forty".