261006690 has 32 divisors (see below), whose sum is σ = 715904640. Its totient is φ = 59658624.

The previous prime is 261006677. The next prime is 261006703. The reversal of 261006690 is 96600162.

It is an interprime number because it is at equal distance from previous prime (261006677) and next prime (261006703).

It is a super-2 number, since 2×261006690² = 136248984449512200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 621235 + ... + 621654.

It is an arithmetic number, because the mean of its divisors is an integer number (22372020).

Almost surely, 2^261006690 is an apocalyptic number.

261006690 is an abundant number, since it is smaller than the sum of its proper divisors (454897950).

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

261006690 is a wasteful number, since it uses less digits than its factorization.

261006690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1242906.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 261006690 is about 16155.7014703788. The cubic root of 261006690 is about 639.0731130265.

The spelling of 261006690 in words is "two hundred sixty-one million, six thousand, six hundred ninety".