215493497028 has 18 divisors (see below), whose sum is σ = 544719673134. Its totient is φ = 71831165664.

The previous prime is 215493496997. The next prime is 215493497029. The reversal of 215493497028 is 820794394512.

215493497028 is a `hidden beast` number, since 2 + 1 + 549 + 3 + 4 + 9 + 70 + 28 = 666.

It can be written as a sum of positive squares in only one way, i.e., 211381096644 + 4112400384 = 459762^2 + 64128^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×215493497028² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (215493497029) 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, 2992965201 + ... + 2992965272.

It is an arithmetic number, because the mean of its divisors is an integer number (30262204063).

Almost surely, 2^215493497028 is an apocalyptic number.

It is an amenable number.

215493497028 is an abundant number, since it is smaller than the sum of its proper divisors (329226176106).

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

215493497028 is a wasteful number, since it uses less digits than its factorization.

215493497028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5985930483 (or 5985930478 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 54.

The spelling of 215493497028 in words is "two hundred fifteen billion, four hundred ninety-three million, four hundred ninety-seven thousand, twenty-eight".