72739766 has 16 divisors (see below), whose sum is σ = 119171088. Its totient is φ = 33024000.

The previous prime is 72739763. The next prime is 72739783. The reversal of 72739766 is 66793727.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 72739766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72739763) 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, 25046 + ... + 27798.

It is an arithmetic number, because the mean of its divisors is an integer number (7448193).

Almost surely, 2^72739766 is an apocalyptic number.

72739766 is a deficient number, since it is larger than the sum of its proper divisors (46431322).

72739766 is a wasteful number, since it uses less digits than its factorization.

72739766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3967.

The product of its digits is 666792, while the sum is 47.

The square root of 72739766 is about 8528.7611058113. The cubic root of 72739766 is about 417.4367045212.

The spelling of 72739766 in words is "seventy-two million, seven hundred thirty-nine thousand, seven hundred sixty-six".