157722890 has 16 divisors (see below), whose sum is σ = 305740008. Its totient is φ = 58236096.

The previous prime is 157722869. The next prime is 157722899. The reversal of 157722890 is 98227751.

It can be written as a sum of positive squares in 4 ways, for example, as 130484929 + 27237961 = 11423^2 + 5219^2 .

It is not an unprimeable number, because it can be changed into a prime (157722899) 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, 606497 + ... + 606756.

Almost surely, 2^157722890 is an apocalyptic number.

157722890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

157722890 is a deficient number, since it is larger than the sum of its proper divisors (148017118).

157722890 is a wasteful number, since it uses less digits than its factorization.

157722890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1213273.

The product of its (nonzero) digits is 70560, while the sum is 41.

The square root of 157722890 is about 12558.7774086493. Note that the first 3 decimals coincide. The cubic root of 157722890 is about 540.2957798894.

The spelling of 157722890 in words is "one hundred fifty-seven million, seven hundred twenty-two thousand, eight hundred ninety".