1978754652 has 144 divisors (see below), whose sum is σ = 5870592000. Its totient is φ = 561728160.

The previous prime is 1978754641. The next prime is 1978754663. The reversal of 1978754652 is 2564578791.

1978754652 is a `hidden beast` number, since 1 + 97 + 8 + 7 + 546 + 5 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (1978754641) and next prime (1978754663).

It is a super-2 number, since 2×1978754652² = 7830939945623282208, 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 47 ways as a sum of consecutive naturals, for example, 2358049 + ... + 2358887.

It is an arithmetic number, because the mean of its divisors is an integer number (40768000).

Almost surely, 2^1978754652 is an apocalyptic number.

1978754652 is a gapful number since it is divisible by the number (12) 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 1978754652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2935296000).

1978754652 is an abundant number, since it is smaller than the sum of its proper divisors (3891837348).

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

1978754652 is a wasteful number, since it uses less digits than its factorization.

1978754652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061 (or 1042 counting only the distinct ones).

The product of its digits is 4233600, while the sum is 54.

The square root of 1978754652 is about 44483.1951640167. The cubic root of 1978754652 is about 1255.4439157002.

The spelling of 1978754652 in words is "one billion, nine hundred seventy-eight million, seven hundred fifty-four thousand, six hundred fifty-two".