261734780 has 12 divisors (see below), whose sum is σ = 549643080. Its totient is φ = 104693904.

The previous prime is 261734777. The next prime is 261734783. The reversal of 261734780 is 87437162.

It is an interprime number because it is at equal distance from previous prime (261734777) and next prime (261734783).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261734783) 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, 6543350 + ... + 6543389.

It is an arithmetic number, because the mean of its divisors is an integer number (45803590).

Almost surely, 2^261734780 is an apocalyptic number.

261734780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261734780 is an abundant number, since it is smaller than the sum of its proper divisors (287908300).

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

261734780 is a wasteful number, since it uses less digits than its factorization.

261734780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13086748 (or 13086746 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 38.

The square root of 261734780 is about 16178.2193086878. The cubic root of 261734780 is about 639.6668024719. Note that the first 3 decimals are identical.

The spelling of 261734780 in words is "two hundred sixty-one million, seven hundred thirty-four thousand, seven hundred eighty".