72991430 has 8 divisors (see below), whose sum is σ = 131384592. Its totient is φ = 29196568.

The previous prime is 72991427. The next prime is 72991447. The reversal of 72991430 is 3419927.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3649562 + ... + 3649581.

It is an arithmetic number, because the mean of its divisors is an integer number (16423074).

Almost surely, 2^72991430 is an apocalyptic number.

72991430 is a deficient number, since it is larger than the sum of its proper divisors (58393162).

72991430 is a wasteful number, since it uses less digits than its factorization.

72991430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7299150.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 72991430 is about 8543.5022092816. The cubic root of 72991430 is about 417.9175642324.

The spelling of 72991430 in words is "seventy-two million, nine hundred ninety-one thousand, four hundred thirty".