261620524 has 24 divisors (see below), whose sum is σ = 501984000. Its totient is φ = 118316880.

The previous prime is 261620509. The next prime is 261620551. The reversal of 261620524 is 425026162.

It is a junction number, because it is equal to n+sod(n) for n = 261620492 and 261620501.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6184 + ... + 23695.

It is an arithmetic number, because the mean of its divisors is an integer number (20916000).

Almost surely, 2^261620524 is an apocalyptic number.

It is an amenable number.

261620524 is a deficient number, since it is larger than the sum of its proper divisors (240363476).

261620524 is a wasteful number, since it uses less digits than its factorization.

261620524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30093 (or 30091 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 261620524 is about 16174.6877558734. The cubic root of 261620524 is about 639.5737102616.

Adding to 261620524 its reverse (425026162), we get a palindrome (686646686).

It can be divided in two parts, 261620 and 524, that added together give a 18-th power (262144 = 2¹⁸).

The spelling of 261620524 in words is "two hundred sixty-one million, six hundred twenty thousand, five hundred twenty-four".