72691780 has 24 divisors (see below), whose sum is σ = 174460608. Its totient is φ = 24922848.

The previous prime is 72691763. The next prime is 72691783. The reversal of 72691780 is 8719627.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (72691783) 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, 259474 + ... + 259753.

It is an arithmetic number, because the mean of its divisors is an integer number (7269192).

Almost surely, 2^72691780 is an apocalyptic number.

72691780 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

72691780 is an abundant number, since it is smaller than the sum of its proper divisors (101768828).

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

72691780 is a wasteful number, since it uses less digits than its factorization.

72691780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 519243 (or 519241 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 72691780 is about 8525.9474546821. The cubic root of 72691780 is about 417.3448908076.

The spelling of 72691780 in words is "seventy-two million, six hundred ninety-one thousand, seven hundred eighty".