91878740448 has 48 divisors (see below), whose sum is σ = 263107305216. Its totient is φ = 27842042240.

The previous prime is 91878740431. The next prime is 91878740453. The reversal of 91878740448 is 84404787819.

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 91878740391 and 91878740400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43502136 + ... + 43504247.

It is an arithmetic number, because the mean of its divisors is an integer number (5481402192).

Almost surely, 2^91878740448 is an apocalyptic number.

It is an amenable number.

91878740448 is an abundant number, since it is smaller than the sum of its proper divisors (171228564768).

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

91878740448 is a wasteful number, since it uses less digits than its factorization.

91878740448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87006407 (or 87006399 counting only the distinct ones).

The product of its (nonzero) digits is 14450688, while the sum is 60.

The spelling of 91878740448 in words is "ninety-one billion, eight hundred seventy-eight million, seven hundred forty thousand, four hundred forty-eight".