157021778 has 8 divisors (see below), whose sum is σ = 235704060. Its totient is φ = 78453760.

The previous prime is 157021763. The next prime is 157021801. The reversal of 157021778 is 877120751.

It can be written as a sum of positive squares in 2 ways, for example, as 156825529 + 196249 = 12523^2 + 443^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25043 + ... + 30678.

Almost surely, 2^157021778 is an apocalyptic number.

157021778 is a deficient number, since it is larger than the sum of its proper divisors (78682282).

157021778 is a wasteful number, since it uses less digits than its factorization.

157021778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57132.

The product of its (nonzero) digits is 27440, while the sum is 38.

The square root of 157021778 is about 12530.8330928155. The cubic root of 157021778 is about 539.4940139164.

The spelling of 157021778 in words is "one hundred fifty-seven million, twenty-one thousand, seven hundred seventy-eight".