72571767 has 4 divisors (see below), whose sum is σ = 96762360. Its totient is φ = 48381176.

The previous prime is 72571753. The next prime is 72571771. The reversal of 72571767 is 76717527.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72571767 - 2¹⁴ = 72555383 is a prime.

It is a super-2 number, since 2×72571767² = 10533322731004578, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72571567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12095292 + ... + 12095297.

It is an arithmetic number, because the mean of its divisors is an integer number (24190590).

Almost surely, 2^72571767 is an apocalyptic number.

72571767 is a deficient number, since it is larger than the sum of its proper divisors (24190593).

72571767 is a wasteful number, since it uses less digits than its factorization.

72571767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24190592.

The product of its digits is 144060, while the sum is 42.

The square root of 72571767 is about 8518.9064439046. The cubic root of 72571767 is about 417.1150876493.

Subtracting 72571767 from its reverse (76717527), we obtain a triangular number (4145760 = T₂₈₇₉).

The spelling of 72571767 in words is "seventy-two million, five hundred seventy-one thousand, seven hundred sixty-seven".