721076940 has 36 divisors (see below), whose sum is σ = 2187267264. Its totient is φ = 192287136.

The previous prime is 721076929. The next prime is 721076953. The reversal of 721076940 is 49670127.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

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 = 721076895 and 721076904.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2002812 + ... + 2003171.

It is an arithmetic number, because the mean of its divisors is an integer number (60757424).

Almost surely, 2^721076940 is an apocalyptic number.

It is an amenable number.

721076940 is an abundant number, since it is smaller than the sum of its proper divisors (1466190324).

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

721076940 is a wasteful number, since it uses less digits than its factorization.

721076940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4005998 (or 4005993 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 721076940 is about 26852.8758236432. The cubic root of 721076940 is about 896.7275974374.

The spelling of 721076940 in words is "seven hundred twenty-one million, seventy-six thousand, nine hundred forty".