157440578 has 4 divisors (see below), whose sum is σ = 236160870. Its totient is φ = 78720288.

The previous prime is 157440571. The next prime is 157440607. The reversal of 157440578 is 875044751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 875044751 = 7 ⋅125006393.

It can be written as a sum of positive squares in only one way, i.e., 96491329 + 60949249 = 9823^2 + 7807^2 .

It is not an unprimeable number, because it can be changed into a prime (157440571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39360143 + ... + 39360146.

Almost surely, 2^157440578 is an apocalyptic number.

157440578 is a deficient number, since it is larger than the sum of its proper divisors (78720292).

157440578 is an equidigital number, since it uses as much as digits as its factorization.

157440578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78720291.

The product of its (nonzero) digits is 156800, while the sum is 41.

The square root of 157440578 is about 12547.5327455241. The cubic root of 157440578 is about 539.9732245526.

The spelling of 157440578 in words is "one hundred fifty-seven million, four hundred forty thousand, five hundred seventy-eight".