140428978 has 16 divisors (see below), whose sum is σ = 214220160. Its totient is φ = 69030000.

The previous prime is 140428963. The next prime is 140429011. The reversal of 140428978 is 879824041.

140428978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 37888 + ... + 41428.

It is an arithmetic number, because the mean of its divisors is an integer number (13388760).

Almost surely, 2^140428978 is an apocalyptic number.

140428978 is a deficient number, since it is larger than the sum of its proper divisors (73791182).

140428978 is a wasteful number, since it uses less digits than its factorization.

140428978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3873.

The product of its (nonzero) digits is 129024, while the sum is 43.

The square root of 140428978 is about 11850.2733301810. The cubic root of 140428978 is about 519.7792184040.

The spelling of 140428978 in words is "one hundred forty million, four hundred twenty-eight thousand, nine hundred seventy-eight".