1978676700 has 432 divisors, whose sum is σ = 7757836800. Its totient is φ = 378892800.

The previous prime is 1978676681. The next prime is 1978676717. The reversal of 1978676700 is 76768791.

It is a happy number.

It is a super-2 number, since 2×1978676700² = 7830322966245780000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 3303001 + ... + 3303599.

Almost surely, 2^1978676700 is an apocalyptic number.

1978676700 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 1978676700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3878918400).

1978676700 is an abundant number, since it is smaller than the sum of its proper divisors (5779160100).

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

1978676700 is a wasteful number, since it uses less digits than its factorization.

1978676700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658 (or 640 counting only the distinct ones).

The product of its (nonzero) digits is 889056, while the sum is 51.

The square root of 1978676700 is about 44482.3189593348. The cubic root of 1978676700 is about 1255.4274296326.

The spelling of 1978676700 in words is "one billion, nine hundred seventy-eight million, six hundred seventy-six thousand, seven hundred".