215040774378 has 64 divisors (see below), whose sum is σ = 453477076992. Its totient is φ = 67846996800.

The previous prime is 215040774373. The next prime is 215040774383. The reversal of 215040774378 is 873477040512.

It is an interprime number because it is at equal distance from previous prime (215040774373) and next prime (215040774383).

It is not an unprimeable number, because it can be changed into a prime (215040774373) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35441301 + ... + 35447367.

It is an arithmetic number, because the mean of its divisors is an integer number (7085579328).

Almost surely, 2^215040774378 is an apocalyptic number.

215040774378 is an abundant number, since it is smaller than the sum of its proper divisors (238436302614).

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

215040774378 is a wasteful number, since it uses less digits than its factorization.

215040774378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8739.

The product of its (nonzero) digits is 1317120, while the sum is 48.

The spelling of 215040774378 in words is "two hundred fifteen billion, forty million, seven hundred seventy-four thousand, three hundred seventy-eight".