157978278 has 48 divisors (see below), whose sum is σ = 350475840. Its totient is φ = 51414912.

The previous prime is 157978231. The next prime is 157978279. The reversal of 157978278 is 872879751.

It is a happy number.

157978278 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157978279) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 142675 + ... + 143777.

It is an arithmetic number, because the mean of its divisors is an integer number (7301580).

Almost surely, 2^157978278 is an apocalyptic number.

157978278 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

157978278 is an abundant number, since it is smaller than the sum of its proper divisors (192497562).

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

157978278 is a wasteful number, since it uses less digits than its factorization.

157978278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1293 (or 1290 counting only the distinct ones).

The product of its digits is 1975680, while the sum is 54.

The square root of 157978278 is about 12568.9410055104. The cubic root of 157978278 is about 540.5872418104.

The spelling of 157978278 in words is "one hundred fifty-seven million, nine hundred seventy-eight thousand, two hundred seventy-eight".