72291798 has 16 divisors (see below), whose sum is σ = 160648560. Its totient is φ = 24097248.

The previous prime is 72291797. The next prime is 72291799. The reversal of 72291798 is 89719227.

It is an interprime number because it is at equal distance from previous prime (72291797) and next prime (72291799).

It is a super-2 number, since 2×72291798² = 10452208116145608, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72291797) 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, 669315 + ... + 669422.

It is an arithmetic number, because the mean of its divisors is an integer number (10040535).

Almost surely, 2^72291798 is an apocalyptic number.

72291798 is an abundant number, since it is smaller than the sum of its proper divisors (88356762).

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

72291798 is a wasteful number, since it uses less digits than its factorization.

72291798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1338748 (or 1338742 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The square root of 72291798 is about 8502.4583503831. The cubic root of 72291798 is about 416.5780110756.

The spelling of 72291798 in words is "seventy-two million, two hundred ninety-one thousand, seven hundred ninety-eight".