77421378234 has 64 divisors (see below), whose sum is σ = 166236733440. Its totient is φ = 23991888960.

The previous prime is 77421378227. The next prime is 77421378241. The reversal of 77421378234 is 43287312477.

It is an interprime number because it is at equal distance from previous prime (77421378227) and next prime (77421378241).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 472477 + ... + 614879.

It is an arithmetic number, because the mean of its divisors is an integer number (2597448960).

Almost surely, 2^77421378234 is an apocalyptic number.

77421378234 is a gapful number since it is divisible by the number (74) formed by its first and last digit.

77421378234 is an abundant number, since it is smaller than the sum of its proper divisors (88815355206).

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

77421378234 is a wasteful number, since it uses less digits than its factorization.

77421378234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142555.

The product of its digits is 1580544, while the sum is 48.

The spelling of 77421378234 in words is "seventy-seven billion, four hundred twenty-one million, three hundred seventy-eight thousand, two hundred thirty-four".