81849310 has 16 divisors (see below), whose sum is σ = 152409600. Its totient is φ = 31610656.

The previous prime is 81849301. The next prime is 81849311. The reversal of 81849310 is 1394818.

It is a happy number.

It is a super-2 number, since 2×81849310² = 13398619094952200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81849311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140830 + ... + 141409.

It is an arithmetic number, because the mean of its divisors is an integer number (9525600).

Almost surely, 2^81849310 is an apocalyptic number.

81849310 is a deficient number, since it is larger than the sum of its proper divisors (70560290).

81849310 is a wasteful number, since it uses less digits than its factorization.

81849310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282275.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 81849310 is about 9047.0608486956. The cubic root of 81849310 is about 434.1818594101.

The spelling of 81849310 in words is "eighty-one million, eight hundred forty-nine thousand, three hundred ten".