158978690 has 16 divisors (see below), whose sum is σ = 308174328. Its totient is φ = 58699776.

The previous prime is 158978657. The next prime is 158978717. The reversal of 158978690 is 96879851.

It can be written as a sum of positive squares in 4 ways, for example, as 109599961 + 49378729 = 10469^2 + 7027^2 .

It is a super-2 number, since 2×158978690² = 50548447748232200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 611327 + ... + 611586.

Almost surely, 2^158978690 is an apocalyptic number.

158978690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

158978690 is a deficient number, since it is larger than the sum of its proper divisors (149195638).

158978690 is a wasteful number, since it uses less digits than its factorization.

158978690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222933.

The product of its (nonzero) digits is 1088640, while the sum is 53.

The square root of 158978690 is about 12608.6751881393. The cubic root of 158978690 is about 541.7259477000.

The spelling of 158978690 in words is "one hundred fifty-eight million, nine hundred seventy-eight thousand, six hundred ninety".