156780645 has 24 divisors (see below), whose sum is σ = 291805344. Its totient is φ = 71670816.

The previous prime is 156780619. The next prime is 156780649. The reversal of 156780645 is 546087651.

It is not a de Polignac number, because 156780645 - 2⁷ = 156780517 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 156780597 and 156780606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156780649) 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 in 23 ways as a sum of consecutive naturals, for example, 105919 + ... + 107388.

It is an arithmetic number, because the mean of its divisors is an integer number (12158556).

Almost surely, 2^156780645 is an apocalyptic number.

156780645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

156780645 is a deficient number, since it is larger than the sum of its proper divisors (135024699).

156780645 is a wasteful number, since it uses less digits than its factorization.

156780645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213329 (or 213322 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 42.

The square root of 156780645 is about 12521.2078091532. The cubic root of 156780645 is about 539.2177115671.

The spelling of 156780645 in words is "one hundred fifty-six million, seven hundred eighty thousand, six hundred forty-five".