81277952 has 176 divisors, whose sum is σ = 212232960. Its totient is φ = 30277632.

The previous prime is 81277927. The next prime is 81277979. The reversal of 81277952 is 25977218.

It is a super-2 number, since 2×81277952² = 13212210962628608, which contains 22 as substring.

Its product of digits (70560) is a multiple of the sum of its prime factors (96).

It is a congruent number.

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, 2802674 + ... + 2802702.

Almost surely, 2^81277952 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81277952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106116480).

81277952 is an abundant number, since it is smaller than the sum of its proper divisors (130955008).

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

81277952 is a wasteful number, since it uses less digits than its factorization.

81277952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96 (or 78 counting only the distinct ones).

The product of its digits is 70560, while the sum is 41.

The square root of 81277952 is about 9015.4285533190. The cubic root of 81277952 is about 433.1692149051.

The spelling of 81277952 in words is "eighty-one million, two hundred seventy-seven thousand, nine hundred fifty-two".