7290091440 has 120 divisors (see below), whose sum is σ = 25272394368. Its totient is φ = 1881308160.

The previous prime is 7290091433. The next prime is 7290091483. The reversal of 7290091440 is 441900927.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×7290091440² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 7290091395 and 7290091404.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 140989 + ... + 185628.

Almost surely, 2^7290091440 is an apocalyptic number.

It is an amenable number.

7290091440 is an abundant number, since it is smaller than the sum of its proper divisors (17982302928).

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

7290091440 is a wasteful number, since it uses less digits than its factorization.

7290091440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326667 (or 326658 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 7290091440 is about 85382.0323018842. The cubic root of 7290091440 is about 1938.9993280527. Note that the first 3 decimals are identical.

The spelling of 7290091440 in words is "seven billion, two hundred ninety million, ninety-one thousand, four hundred forty".