215378733 has 16 divisors (see below), whose sum is σ = 293106240. Its totient is φ = 140636544.

The previous prime is 215378663. The next prime is 215378747. The reversal of 215378733 is 337873512.

It is a happy number.

It is not a de Polignac number, because 215378733 - 2⁸ = 215378477 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 215378691 and 215378700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215378753) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49785 + ... + 53937.

It is an arithmetic number, because the mean of its divisors is an integer number (18319140).

Almost surely, 2^215378733 is an apocalyptic number.

It is an amenable number.

215378733 is a deficient number, since it is larger than the sum of its proper divisors (77727507).

215378733 is a wasteful number, since it uses less digits than its factorization.

215378733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4508.

The product of its digits is 105840, while the sum is 39.

The square root of 215378733 is about 14675.7873042641. The cubic root of 215378733 is about 599.4242003792.

The spelling of 215378733 in words is "two hundred fifteen million, three hundred seventy-eight thousand, seven hundred thirty-three".