7740021240 has 96 divisors (see below), whose sum is σ = 28748659680. Its totient is φ = 1769147136.

The previous prime is 7740021209. The next prime is 7740021253. The reversal of 7740021240 is 421200477.

It is a happy number.

7740021240 is a `hidden beast` number, since 7 + 7 + 400 + 212 + 40 = 666.

It is a super-2 number, since 2×7740021240² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 1533199 + ... + 1538238.

It is an arithmetic number, because the mean of its divisors is an integer number (299465205).

Almost surely, 2^7740021240 is an apocalyptic number.

7740021240 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

7740021240 is an abundant number, since it is smaller than the sum of its proper divisors (21008638440).

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

7740021240 is a wasteful number, since it uses less digits than its factorization.

7740021240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3071461 (or 3071454 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 27.

The square root of 7740021240 is about 87977.3905046064. The cubic root of 7740021240 is about 1978.0960884194.

The spelling of 7740021240 in words is "seven billion, seven hundred forty million, twenty-one thousand, two hundred forty".