1242778680 has 384 divisors, whose sum is σ = 4901472000. Its totient is φ = 277655040.

The previous prime is 1242778643. The next prime is 1242778697. The reversal of 1242778680 is 868772421.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2007411 + ... + 2008029.

It is an arithmetic number, because the mean of its divisors is an integer number (12764250).

Almost surely, 2^1242778680 is an apocalyptic number.

1242778680 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 1242778680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2450736000).

1242778680 is an abundant number, since it is smaller than the sum of its proper divisors (3658693320).

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

1242778680 is a wasteful number, since it uses less digits than its factorization.

1242778680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676 (or 653 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 45.

The square root of 1242778680 is about 35253.0662496186. The cubic root of 1242778680 is about 1075.1389558974.

The spelling of 1242778680 in words is "one billion, two hundred forty-two million, seven hundred seventy-eight thousand, six hundred eighty".