72748002640 has 80 divisors (see below), whose sum is σ = 169980870528. Its totient is φ = 28954695168.

The previous prime is 72748002637. The next prime is 72748002659. The reversal of 72748002640 is 4620084727.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 72748002593 and 72748002602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19310037 + ... + 19313803.

Almost surely, 2^72748002640 is an apocalyptic number.

It is an amenable number.

72748002640 is an abundant number, since it is smaller than the sum of its proper divisors (97232867888).

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

72748002640 is a wasteful number, since it uses less digits than its factorization.

72748002640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4916 (or 4910 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 40.

The spelling of 72748002640 in words is "seventy-two billion, seven hundred forty-eight million, two thousand, six hundred forty".