156689690 has 8 divisors (see below), whose sum is σ = 282041460. Its totient is φ = 62675872.

The previous prime is 156689669. The next prime is 156689693. The reversal of 156689690 is 96986651.

156689690 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 140873161 + 15816529 = 11869^2 + 3977^2 .

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

It is a super-2 number, since 2×156689690² = 49103317904592200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (156689693) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7834475 + ... + 7834494.

Almost surely, 2^156689690 is an apocalyptic number.

156689690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

156689690 is a deficient number, since it is larger than the sum of its proper divisors (125351770).

156689690 is a wasteful number, since it uses less digits than its factorization.

156689690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15668976.

The product of its (nonzero) digits is 699840, while the sum is 50.

The square root of 156689690 is about 12517.5752444313. The cubic root of 156689690 is about 539.1134171578.

The spelling of 156689690 in words is "one hundred fifty-six million, six hundred eighty-nine thousand, six hundred ninety".