7978533800 has 24 divisors (see below), whose sum is σ = 18550091550. Its totient is φ = 3191413440.

The previous prime is 7978533799. The next prime is 7978533803. The reversal of 7978533800 is 83358797.

It can be written as a sum of positive squares in 3 ways, for example, as 6288172804 + 1690360996 = 79298^2 + 41114^2 .

It is a Harshad number since it is a multiple of its sum of digits (50).

It is not an unprimeable number, because it can be changed into a prime (7978533803) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19946135 + ... + 19946534.

Almost surely, 2^7978533800 is an apocalyptic number.

It is an amenable number.

7978533800 is an abundant number, since it is smaller than the sum of its proper divisors (10571557750).

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

7978533800 is a wasteful number, since it uses less digits than its factorization.

7978533800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39892685 (or 39892676 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 50.

The square root of 7978533800 is about 89322.6387877116. The cubic root of 7978533800 is about 1998.2095476184.

The spelling of 7978533800 in words is "seven billion, nine hundred seventy-eight million, five hundred thirty-three thousand, eight hundred".