81062490 has 16 divisors (see below), whose sum is σ = 194550048. Its totient is φ = 21616656.

The previous prime is 81062441. The next prime is 81062491. The reversal of 81062490 is 9426018.

It is a super-2 number, since 2×81062490² = 13142254570000200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 2702083 = 81062490 / (8 + 1 + 0 + 6 + 2 + 4 + 9 + 0).

It is not an unprimeable number, because it can be changed into a prime (81062491) 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, 1351012 + ... + 1351071.

It is an arithmetic number, because the mean of its divisors is an integer number (12159378).

Almost surely, 2^81062490 is an apocalyptic number.

81062490 is an abundant number, since it is smaller than the sum of its proper divisors (113487558).

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

81062490 is a wasteful number, since it uses less digits than its factorization.

81062490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2702093.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 81062490 is about 9003.4709973432. The cubic root of 81062490 is about 432.7861093745.

The spelling of 81062490 in words is "eighty-one million, sixty-two thousand, four hundred ninety".