261098840 has 16 divisors (see below), whose sum is σ = 587472480. Its totient is φ = 104439520.

The previous prime is 261098839. The next prime is 261098843. The reversal of 261098840 is 48890162.

It is a junction number, because it is equal to n+sod(n) for n = 261098794 and 261098803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261098843) 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, 3263696 + ... + 3263775.

It is an arithmetic number, because the mean of its divisors is an integer number (36717030).

Almost surely, 2^261098840 is an apocalyptic number.

261098840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261098840 is an abundant number, since it is smaller than the sum of its proper divisors (326373640).

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

261098840 is a wasteful number, since it uses less digits than its factorization.

261098840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6527482 (or 6527478 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 261098840 is about 16158.5531530518. The cubic root of 261098840 is about 639.1483137275.

The spelling of 261098840 in words is "two hundred sixty-one million, ninety-eight thousand, eight hundred forty".