78540468402 has 128 divisors (see below), whose sum is σ = 180592312320. Its totient is φ = 22539851840.

The previous prime is 78540468373. The next prime is 78540468427. The reversal of 78540468402 is 20486404587.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 91008223 + ... + 91009085.

It is an arithmetic number, because the mean of its divisors is an integer number (1410877440).

Almost surely, 2^78540468402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78540468402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90296156160).

78540468402 is an abundant number, since it is smaller than the sum of its proper divisors (102051843918).

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

78540468402 is a wasteful number, since it uses less digits than its factorization.

78540468402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1428.

The product of its (nonzero) digits is 1720320, while the sum is 48.

The spelling of 78540468402 in words is "seventy-eight billion, five hundred forty million, four hundred sixty-eight thousand, four hundred two".