7215401378 has 8 divisors (see below), whose sum is σ = 10833831660. Its totient is φ = 3604124160.

The previous prime is 7215401371. The next prime is 7215401381. The reversal of 7215401378 is 8731045127.

It can be written as a sum of positive squares in 2 ways, for example, as 7190531209 + 24870169 = 84797^2 + 4987^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (7215401371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1785743 + ... + 1789778.

Almost surely, 2^7215401378 is an apocalyptic number.

7215401378 is a deficient number, since it is larger than the sum of its proper divisors (3618430282).

7215401378 is a wasteful number, since it uses less digits than its factorization.

7215401378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3576532.

The product of its (nonzero) digits is 47040, while the sum is 38.

The square root of 7215401378 is about 84943.5187521685. The cubic root of 7215401378 is about 1932.3546281868.

The spelling of 7215401378 in words is "seven billion, two hundred fifteen million, four hundred one thousand, three hundred seventy-eight".