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76249981 = 1722719759
BaseRepresentation
bin1001000101101…
…11101101111101
312022110220022101
410202313231331
5124004444411
611322145101
71614054103
oct442675575
9168426271
1076249981
113a04a815
1221652191
1312a49542
14a1abc73
156a628c1
hex48b7b7d

76249981 has 8 divisors (see below), whose sum is σ = 81095040. Its totient is φ = 71444928.

The previous prime is 76249967. The next prime is 76249997. The reversal of 76249981 is 18994267.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-76249981 is a prime.

It is a super-2 number, since 2×762499812 = 11628119205000722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76249951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6021 + ... + 13738.

It is an arithmetic number, because the mean of its divisors is an integer number (10136880).

Almost surely, 276249981 is an apocalyptic number.

It is an amenable number.

76249981 is a deficient number, since it is larger than the sum of its proper divisors (4845059).

76249981 is a wasteful number, since it uses less digits than its factorization.

76249981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20003.

The product of its digits is 217728, while the sum is 46.

The square root of 76249981 is about 8732.1235103496. The cubic root of 76249981 is about 424.0462692031.

The spelling of 76249981 in words is "seventy-six million, two hundred forty-nine thousand, nine hundred eighty-one".

Divisors: 1 17 227 3859 19759 335903 4485293 76249981