7216400 has 30 divisors (see below), whose sum is σ = 17338362. Its totient is φ = 2886400.

The previous prime is 7216373. The next prime is 7216403. The reversal of 7216400 is 46127.

It can be written as a sum of positive squares in 3 ways, for example, as 12544 + 7203856 = 112^2 + 2684^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (7216403) 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, 8621 + ... + 9420.

Almost surely, 2^7216400 is an apocalyptic number.

It is an amenable number.

7216400 is an abundant number, since it is smaller than the sum of its proper divisors (10121962).

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

7216400 is a wasteful number, since it uses less digits than its factorization.

7216400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18059 (or 18048 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 7216400 is about 2686.3357943489. The cubic root of 7216400 is about 193.2443770967.

The spelling of 7216400 in words is "seven million, two hundred sixteen thousand, four hundred".