157720026 has 16 divisors (see below), whose sum is σ = 332042400. Its totient is φ = 49806288.

The previous prime is 157720021. The next prime is 157720027. The reversal of 157720026 is 620027751.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 157719975 and 157720002.

It is not an unprimeable number, because it can be changed into a prime (157720021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 691641 + ... + 691868.

It is an arithmetic number, because the mean of its divisors is an integer number (20752650).

Almost surely, 2^157720026 is an apocalyptic number.

157720026 is an abundant number, since it is smaller than the sum of its proper divisors (174322374).

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

157720026 is a wasteful number, since it uses less digits than its factorization.

157720026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1383533.

The product of its (nonzero) digits is 5880, while the sum is 30.

The square root of 157720026 is about 12558.6633842937. The cubic root of 157720026 is about 540.2925095619.

Adding to 157720026 its reverse (620027751), we get a palindrome (777747777).

The spelling of 157720026 in words is "one hundred fifty-seven million, seven hundred twenty thousand, twenty-six".