78269740 has 48 divisors (see below), whose sum is σ = 173869920. Its totient is φ = 29514240.

The previous prime is 78269693. The next prime is 78269743. The reversal of 78269740 is 4796287.

It is a super-2 number, since 2×78269740² = 12252304399335200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (78269743) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106414 + ... + 107146.

It is an arithmetic number, because the mean of its divisors is an integer number (3622290).

Almost surely, 2^78269740 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78269740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86934960).

78269740 is an abundant number, since it is smaller than the sum of its proper divisors (95600180).

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

78269740 is a wasteful number, since it uses less digits than its factorization.

78269740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042 (or 1040 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 43.

The square root of 78269740 is about 8847.0187068865. The cubic root of 78269740 is about 427.7578258468.

The spelling of 78269740 in words is "seventy-eight million, two hundred sixty-nine thousand, seven hundred forty".