157457778 has 8 divisors (see below), whose sum is σ = 314915568. Its totient is φ = 52485924.

The previous prime is 157457771. The next prime is 157457813. The reversal of 157457778 is 877754751.

157457778 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

157457778 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 157457778.

It is not an unprimeable number, because it can be changed into a prime (157457771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13121476 + ... + 13121487.

It is an arithmetic number, because the mean of its divisors is an integer number (39364446).

Almost surely, 2^157457778 is an apocalyptic number.

157457778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

157457778 is a wasteful number, since it uses less digits than its factorization.

157457778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26242968.

The product of its digits is 1920800, while the sum is 51.

The square root of 157457778 is about 12548.2181205142. The cubic root of 157457778 is about 539.9928874235.

The spelling of 157457778 in words is "one hundred fifty-seven million, four hundred fifty-seven thousand, seven hundred seventy-eight".