49971978 has 96 divisors (see below), whose sum is σ = 132123264. Its totient is φ = 13856832.

The previous prime is 49971973. The next prime is 49971979. The reversal of 49971978 is 87917994.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (49971973) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 125676 + ... + 126072.

It is an arithmetic number, because the mean of its divisors is an integer number (1376284).

Almost surely, 2^49971978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 49971978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66061632).

49971978 is an abundant number, since it is smaller than the sum of its proper divisors (82151286).

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

49971978 is a wasteful number, since it uses less digits than its factorization.

49971978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458 (or 446 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 54.

The square root of 49971978 is about 7069.0860795438. The cubic root of 49971978 is about 368.3343143826.

The spelling of 49971978 in words is "forty-nine million, nine hundred seventy-one thousand, nine hundred seventy-eight".