261677328 has 80 divisors (see below), whose sum is σ = 780860736. Its totient is φ = 74629120.

The previous prime is 261677321. The next prime is 261677359. The reversal of 261677328 is 823776162.

It is a self number, because there is not a number n which added to its sum of digits gives 261677328.

It is not an unprimeable number, because it can be changed into a prime (261677321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5601 + ... + 23552.

Almost surely, 2^261677328 is an apocalyptic number.

It is an amenable number.

261677328 is an abundant number, since it is smaller than the sum of its proper divisors (519183408).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261677328 is a wasteful number, since it uses less digits than its factorization.

261677328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29192 (or 29186 counting only the distinct ones).

The product of its digits is 169344, while the sum is 42.

The square root of 261677328 is about 16176.4436140952. The cubic root of 261677328 is about 639.6199957688.

The spelling of 261677328 in words is "two hundred sixty-one million, six hundred seventy-seven thousand, three hundred twenty-eight".