1245656880 has 560 divisors, whose sum is σ = 4918185216. Its totient is φ = 291133440.

The previous prime is 1245656821. The next prime is 1245656899. The reversal of 1245656880 is 886565421.

1245656880 is a `hidden beast` number, since 1 + 2 + 4 + 5 + 6 + 568 + 80 = 666.

It is a super-2 number, since 2×1245656880² = 3103322125382668800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 23502934 + ... + 23502986.

Almost surely, 2^1245656880 is an apocalyptic number.

1245656880 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 1245656880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2459092608).

1245656880 is an abundant number, since it is smaller than the sum of its proper divisors (3672528336).

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

1245656880 is a wasteful number, since it uses less digits than its factorization.

1245656880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128 (or 107 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 45.

The square root of 1245656880 is about 35293.8646226224. The cubic root of 1245656880 is about 1075.9683015127.

The spelling of 1245656880 in words is "one billion, two hundred forty-five million, six hundred fifty-six thousand, eight hundred eighty".